

A056846


Number of polyominoids containing n squares: these are 2dimensional polyominoes in a threedimensional grid (edgeconnected squares, like the floors, ceilings and walls of a building).


2



1, 2, 11, 80, 780, 8781, 104828, 1298506, 16462696, 212457221, 2780615627, 36817036777
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OFFSET

1,2


REFERENCES

R. A. Epstein, The Theory of Gambling and Statistical Logic, 1977, Academic Press, ISBN 0122407601 (pages 362369 discuss polyforms, including Epstein's polyominoids).


LINKS

Table of n, a(n) for n=1..12.
M. Keller, Counting polyforms


CROSSREFS

Sequence in context: A027110 A118969 A181068 * A197718 A215654 A209094
Adjacent sequences: A056843 A056844 A056845 * A056847 A056848 A056849


KEYWORD

nonn,nice


AUTHOR

N. J. A. Sloane, James A. Sellers, Aug 28 2000


EXTENSIONS

Corrected and extended by Joseph Myers, Sep 24 2002


STATUS

approved



