|
Search: id:A022444
|
|
|
| A022444 |
|
Number of self-avoiding closed walks (from 0 to 0) of length 2n in strip {-1, 0, 1} X Z. |
|
+0
2
|
|
| 1, 0, 8, 16, 44, 112, 252, 564, 1276, 2840, 6220, 13532, 29292, 63024, 134876, 287428
(list; graph; listen)
|
|
|
OFFSET
|
0,3
|
|
|
REFERENCES
|
J. Labelle, Self-avoiding walks and polyominoes in strips, Bull. ICA, 23 (1998), 88-98.
|
|
FORMULA
|
G.f.: [ -12x^7+16x^6-36x^5+37x^4-24x^3+14x^2-4x+1]/[(1+x^2)^2(1-2x)^2] (conjectured).
|
|
CROSSREFS
|
Sequence in context: A108235 A052207 A038578 this_sequence A089828 A082982 A131539
Adjacent sequences: A022441 A022442 A022443 this_sequence A022445 A022446 A022447
|
|
KEYWORD
|
nonn,walk,easy
|
|
AUTHOR
|
Jacques Labelle (labelle.jacques(AT)uqam.ca)
|
|
|
Search completed in 0.002 seconds
|
