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A151531
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Number of 1-sided polypons with n cells.
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4
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1, 2, 3, 5, 7, 15, 24, 49, 91, 183, 356, 734, 1465, 3017, 6153, 12721, 26230, 54575, 113480, 237296, 496612, 1042785, 2192207, 4619736, 9747966, 20607348
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| The division of a polypon into triangles is considered significant for this sequence, as for A057784. - Joseph Myers, Oct 02 2011
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LINKS
| Ed Pegg, Jr., Illustrations of polyforms
Eric Weisstein's World of Mathematics, Polypon
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CROSSREFS
| Cf. A057784, A151532, A151533.
Sequence in context: A028304 A157833 A175758 * A079987 A085547 A058702
Adjacent sequences: A151528 A151529 A151530 * A151532 A151533 A151534
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KEYWORD
| nonn,hard
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AUTHOR
| Ed Pegg, Jr., (ed(AT)mathpuzzle.com), May 13 2009
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EXTENSIONS
| a(19)-a(26) from Joseph Myers (jsm(AT)polyomino.org.uk), Oct 02 2011
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