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A151531 Number of 1-sided polypons with n cells. 4
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; text; internal format)
OFFSET

1,2

COMMENTS

The division of a polypon into triangles is considered significant for this sequence, as for A057784. - Joseph Myers, Oct 02 2011

LINKS

Table of n, a(n) for n=1..26.

Ed Pegg, Jr., Illustrations of polyforms

Eric Weisstein's World of Mathematics, Polypon

CROSSREFS

Cf. A057784, A151532, A151533.

Sequence in context: A228652 A157833 A175758 * A335203 A079987 A085547

Adjacent sequences:  A151528 A151529 A151530 * A151532 A151533 A151534

KEYWORD

nonn,hard,more

AUTHOR

Ed Pegg Jr, May 13 2009

EXTENSIONS

a(19)-a(26) from Joseph Myers, Oct 02 2011

STATUS

approved

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Last modified August 7 12:19 EDT 2020. Contains 336276 sequences. (Running on oeis4.)