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A056783
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Number of diamond polyominoes with n cells.
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3
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1, 1, 3, 7, 20, 62, 204, 709, 2526, 9212, 33989, 126838, 476597, 1802618, 6850969, 26153537, 100207548, 385225375
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| Also the number of polybricks of size n made of Lego.
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LINKS
| Ed Pegg, Jr., Illustrations of polyforms
M. Keller, More information
M. Vicher, Polyforms
Eric Weisstein's World of Mathematics, Polyrhomb [From Eric W. Weisstein (eric(AT)weisstein.com), Apr 24 2009]
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CROSSREFS
| Cf. A057973.
Sequence in context: A132364 A110490 A132868 * A176697 A071688 A110149
Adjacent sequences: A056780 A056781 A056782 * A056784 A056785 A056786
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KEYWORD
| nonn
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AUTHOR
| James A. Sellers (sellersj(AT)math.psu.edu), Aug 28 2000
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EXTENSIONS
| More terms from Don Reble (djr(AT)nk.ca), Nov 01 2001
a(15)-a(18) from Joseph Myers (jsm(AT)polyomino.org.uk), Nov 15 2010
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