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A001170 Number of board-pair-pile polyominoes with n cells.
(Formerly M1638 N0640)
+0
3
1, 2, 6, 19, 63, 216, 760, 2723, 9880, 36168, 133237, 492993, 1829670, 6804267, 25336611, 94416842, 351989967, 1312471879, 4894023222, 18248301701, 68036380665, 253638655582, 945464013411, 3523978989671, 13133649924269 (list; graph; listen)
OFFSET

1,2

REFERENCES

W. F. Lunnon, Counting polyominoes, pp. 347-372 of A. O. L. Atkin and B. J. Birch, editors, Computers in Number Theory. Academic Press, NY, 1971.

LINKS

Moa Apagodu, Counting hexagonal lattice animals.

D. Zeilberger, The umbral transfer-matrix method. III. Counting animals

CROSSREFS

Sequence in context: A109262 A006724 A057409 this_sequence A001168 A119255 A071969

Adjacent sequences: A001167 A001168 A001169 this_sequence A001171 A001172 A001173

KEYWORD

nonn

AUTHOR

njas

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.


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