A309159 Number of generalized polyforms on the snub square tiling with n cells.

1, 2, 2, 4, 10, 28, 79, 235, 720, 2254, 7146, 22927, 74137, 241461, 790838, 2603210, 8604861, 28549166, 95027832, 317229779, 1061764660, 3562113987, 11976146355

Offset

0,2

Comments

The generalized polyforms counted by this sequence are "free", which means that they are counted up to rotation and reflection.

Links

Table of n, a(n) for n=0..22.

Peter Kagey, Counting generalized polyominoes

Wikipedia, Snub square tiling

Crossrefs

Cf. A000105, A000228, A000577.

Sequence in context: A298898 A339830 A078801 * A002420 A284016 A112556

Adjacent sequences: A309156 A309157 A309158 * A309160 A309161 A309162

Keyword

nonn

Author

Peter Kagey and Peter Taylor, Jul 15 2019

Extensions

a(19)-a(22) from Christian Sievers

Status

approved