Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A007291
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A007291 Series expansion for rectilinear polymers on square lattice.
(Formerly M4440)
+0
1
7, 63, 254, 710, 1605, 3157, 5628, 9324, 14595, 21835, 31482, 44018, 59969, 79905, 104440, 134232, 169983, 212439, 262390, 320670, 388157, 465773, 554484, 655300, 769275, 897507, 1041138, 1201354, 1379385 (list; graph; listen)
OFFSET

2,1

REFERENCES

V. B. Priezzhev, Series expansion for rectilinear polymers on the square lattice, J. Phys. A 12 (1979), 2131-2139.

FORMULA

G.f.: (7 + 28x + 9 x^2 ) / ( 1 - x )^5.

a(n)=n(n-1)(11n^2-13n+3)/6 - T. D. Noe (noe(AT)sspectra.com), Feb 09 2007

CROSSREFS

Adjacent sequences: A007288 A007289 A007290 this_sequence A007292 A007293 A007294

Sequence in context: A024089 A060005 A055066 this_sequence A055405 A100741 A043027

KEYWORD

nonn

AUTHOR

Simon Plouffe (plouffe(AT)math.uqam.ca)

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 October 15 09:18 EDT 2008. Contains 145015 sequences.


AT&T Labs Research