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A056846
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Number of polyominoids containing n squares: these are 2-dimensional polyominoes in a three-dimensional grid (edge-connected squares, like the floors, ceilings and walls of a building).
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2
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1, 2, 11, 80, 780, 8781, 104828, 1298506, 16462696, 212457221, 2780615627, 36817036777
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| R. A. Epstein, The Theory of Gambling and Statistical Logic, 1977, Academic Press, ISBN 0-12-240760-1 (pages 362-369 discuss polyforms, including Epstein's polyominoids).
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LINKS
| M. Keller, Counting polyforms
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CROSSREFS
| Sequence in context: A027110 A118969 A181068 * A197718 A104086 A143140
Adjacent sequences: A056843 A056844 A056845 * A056847 A056848 A056849
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KEYWORD
| nonn,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), James A. Sellers (sellersj(AT)math.psu.edu), Aug 28 2000
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EXTENSIONS
| Corrected and extended by Joseph Myers (jsm(AT)polyomino.org.uk), Sep 24 2002
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