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Search: id:A056780
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| A056780 |
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Rectangular polyominoes: number of n-celled polyominoes when the cell is a rectangle. |
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+0
1
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| 1, 2, 3, 9, 21, 68, 208, 730, 2542, 9287, 34053, 127112
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Ed Pegg, Jr., Illustrations of polyforms
M. Vicher, Polyforms
M. Vicher, The 21 5-celled rectangular polyominoes
M. Vicher, The 21 5-celled rectangular polyominoes
Eric Weisstein's World of Mathematics, Polyrect [From Eric W. Weisstein (eric(AT)weisstein.com), Apr 24 2009]
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CROSSREFS
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Sequence in context: A101531 A099607 A077550 this_sequence A141505 A111360 A111238
Adjacent sequences: A056777 A056778 A056779 this_sequence A056781 A056782 A056783
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KEYWORD
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nice,nonn
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AUTHOR
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James A. Sellers (sellersj(AT)math.psu.edu), Aug 28 2000
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Apr 25, 2001
Two more terms from Ed Pegg, Jr., May 13 2009
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