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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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4
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1, 2, 3, 9, 21, 68, 208, 730, 2542, 9287, 34053, 127112, 476849, 1803636, 6851960, 26157362, 100211446, 385239872
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| 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
| Sequence in context: A101531 A099607 A077550 * A141505 A111360 A111238
Adjacent sequences: A056777 A056778 A056779 * A056781 A056782 A056783
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KEYWORD
| nice,nonn
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AUTHOR
| James A. Sellers (sellersj(AT)math.psu.edu), Aug 28 2000
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EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com), Apr 25, 2001
Two more terms from Ed Pegg, Jr., May 13 2009
a(13)-a(18) from Joseph Myers (jsm(AT)polyomino.org.uk), Nov 15 2010
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