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Search: id:A001170
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| A001170 |
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Number of board-pair-pile polyominoes with n cells.
(Formerly M1638 N0640)
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+0
4
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| 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)
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OFFSET
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1,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
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.
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LINKS
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Moa Apagodu, Counting hexagonal lattice animals.
D. Zeilberger, The umbral transfer-matrix method. III. Counting animals
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CROSSREFS
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Sequence in context: A006724 A057409 A141771 this_sequence A001168 A119255 A071969
Adjacent sequences: A001167 A001168 A001169 this_sequence A001171 A001172 A001173
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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