A151524 Number of 2-sided strip polyrhombs with n cells.

1, 1, 3, 5, 12, 24, 58, 126, 300, 686, 1630, 3792, 8983, 21051, 49776, 116858, 275789, 647573, 1525847, 3580673, 8424978, 19755938, 46426810

Offset

1,3

Links

Table of n, a(n) for n=1..23.

Ed Pegg, Jr., Illustrations of polyforms

Eric Weisstein's World of Mathematics, Polyrhomb

Crossrefs

Sequence in context: A090345 A186334 A303587 * A030270 A129757 A135019

Adjacent sequences: A151521 A151522 A151523 * A151525 A151526 A151527

Keyword

nonn,hard,more

Author

Ed Pegg Jr, May 13 2009

Extensions

a(15)-a(23) from Joseph Myers, Nov 22 2010

Status

approved