A151521 Number of 2-sided strip polytans with n cells.

1, 3, 4, 13, 25, 72, 166, 450, 1124, 2973, 7603, 19865, 51199, 132982, 343290, 888309, 2292325, 5918742, 15258937, 39329418

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, A151520.

Extensions

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