A151520 Number of 1-sided strip polytans with n cells.

1, 4, 6, 21, 47, 134, 323, 876, 2224, 5885, 15146, 39574, 102250, 265574, 686208, 1775646, 4583718, 11835037, 30515520, 78652647

Offset: 1

Author

Ed Pegg Jr, May 13 2009

Keywords

• nonn
• hard
• more

Links

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

Crossrefs

Cf. A006074, A151521.

Extensions

a(6)-a(20) from John Mason, Jan 07 2022