Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A138187
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A138187 Hankel transform of C(2n+3,n). +0
2
1, -4, 3, 3, -8, 5, 5, -12, 7, 7, -16, 9, 9, -20, 11, 11, -24, 13, 13, -28, 15, 15, -32, 17, 17, -36, 19, 19, -40, 21, 21, -44, 23, 23, -48, 25, 25, -52, 27, 27, -56, 29, 29, -60, 31, 31, -64, 33, 33, -68, 35, 35, -72, 37, 37, -76, 39, 39, -80, 41 (list; graph; listen)
OFFSET

0,2

COMMENT

Hankel transform of A002054(n+1). Hankel transform of A002054(n) is A057078(n+1).

Partial sums are A138188.

FORMULA

G.f. : (1-2x-2x^2-x^3)/(1+x+x^2)^2;

CROSSREFS

Sequence in context: A006994 A038627 A155835 this_sequence A055525 A007568 A091884

Adjacent sequences: A138184 A138185 A138186 this_sequence A138188 A138189 A138190

KEYWORD

easy,sign

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Mar 04 2008

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


AT&T Labs Research