Submit Sequence to On-Line Encyclopedia of Integer Sequences

Sending in a New Sequence or a Comment on an Existing Sequence to

The On-Line Encyclopedia of Integer Sequences

If your sequence was not in the database and is interesting, please send it to me, and I will (probably) add it!
Reasons for sending in your sequence:

This stakes your claim to it
Your name is immortalized
The next person who stumbles across it will be grateful to you

IMPORTANT: Thousands of people use the sequence database every day.
Please take great care that the terms you send are absolutely correct.
The standards are those of a mathematics reference work.

Include a brief description and if possible enough terms to fill 3 lines on the screen. I need a minimum of 4 terms.

Note that, to be included in the database, the sequence should

consist of integers (though some sequences of fractions have entered by numerator and denominator separately)
be infinite - though there are many exceptions to this rule (even various sequences of subway stops are in the table now)
be interesting

I regret that because of the number of sequences received (an average of over 30 new sequences a day since 1995, or 10000 a year), new sequences cannot be accepted unless they are in the internal format used in the database.

There are 3 ways to put sequences into this format:

Use the Maple or Mathematica formatting scripts provided.

Format the sequences yourself using the information in the help file. There are also all the examples in the database for you to imitate!
If you are planning to submit a series of sequences and would like some A-numbers so you can format them and get the cross-references right, click here!
Use the following form.

To send in a New Sequence or a Comment on an existing sequence: (Please replace these artificial entries with your text. Click here to clear form.)

Your name (required):
Email address (required):

NOTE, Jul 31 2006 (start):
If you have more than 3 lines worth of terms, you could also send them in a separate file (a "b-file").
The format for a b-file is:

with one line per entry. Use the correct offset! Send the file by email to njas@research.att.com.
The above example is the file b000040.txt for the primes, A000040. For other examples see the b-files for A000055, A000594, etc.
(end)

Email addresses will be disguised by replacing @ by (AT) when they appear in the database.
If you don't want your email address to appear at all in the database then say so in one of the windows.
In that case, however, please give a link to your home page in one of the "links" windows
- enter a line that looks something like this:
J. H. Smith, <a href="http://members.aol.org/~JSmth/">Home Page</a>

New sequence (without an A-number)
New sequence (with an A-number from the dispenser) (e.g. A987654)
Comment on existing sequence number (e.g. A987654)
For a new sequence or extension of an old sequence, give the initial terms here:
Please give a few terms even if you are sending a comment, as a check.
For a new sequence, ideally I would like to get enough terms to fill 2 or 3 lines on the screen.
The entries may be separated by commas or spaces.
(For a new sequence, please do a search for a(2),a(3),a(4),a(5) to double-check that the sequence really is new!)

Brief description or definition of sequence (required for a new sequence):
The number of different graphs on n unlabeled nodes.
What is the value of the "index" or "subscript" of the initial term?
(For example, if the sequence counts graphs on n nodes with some property, what is the first value of n?)

Give formula, recurrence or generating function if known:
a(n) = 2*a(n-1) + 3; generating function = 1/(exp(x)-1).

Give up to 3 references:
M. Jones, On the enumeration of graphs, American Mathematical Monthly, Vol. 100 (1993), pp. 1-25.
M. Jones, Further remarks on the enumeration of graphs, preprint, 2001.

Give up to 3 links. Please use the format shown in the examples, or the link won't be visible in the database. If possible include journal references for online articles.
J. H. Smith, <a href="http://www.umass.edu/reports/temp77.html">Perfect Numbers</a>.
A. R. Calderbank, E. M. Rains, P. W. Shor and N. J. A. Sloane, <a href="http://arXiv.org/abs/quant-ph/9608006">Quantum error correction via codes over GF(4)</a>, IEEE Trans. Inform. Theory, 44 (1998), 1369-1387.
J. C. P. Muller and W. T. Gardner, <a href="http://www.anylink.etc/article.pdf">On Cacti Spine Symmetry Groups</a>, J. Math. Horticult. 17 (1995), 862-877.

Give an example: E.g. "a(7)=2 because we can write 7=2+5 or 2+2+3."

Comments:

Program to generate the sequence:

Cross-references to other sequences?
Cf. A987654, A987655.
Select keywords: see the help file for more information.

nonn sign base bref cofr cons core mult dumb easy eigen fini

frac full hard more nice tabl unkn word

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