A151531 Number of 1-sided polypons with n cells.

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

Offset: 1

Author

Ed Pegg Jr, May 13 2009

Keywords

• nonn
• hard
• more

Comments

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

Links

• Ed Pegg, Jr., Illustrations of polyforms
• Eric Weisstein's World of Mathematics, Polypon

Crossrefs

Cf. A057784, A151532, A151533.

Extensions

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