|
| |
|
|
A022444
|
|
Number of self-avoiding closed walks (from 0 to 0) of length 2n in strip {-1, 0, 1} X Z.
|
|
1
| |
|
|
1, 0, 8, 16, 44, 112, 252, 564, 1276, 2840, 6220, 13532, 29292, 63024, 134876, 287428
(list; graph; refs; listen; history; internal format)
|
|
|
|
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: A052207 A038578 A155110 * A089828 A188825 A159038
Adjacent sequences: A022441 A022442 A022443 * A022445 A022446 A022447
|
|
|
KEYWORD
| nonn,walk,easy
|
|
|
AUTHOR
| Jacques Labelle (labelle.jacques(AT)uqam.ca)
|
| |
|
|
