%I
%S 1,2,2,4,10,28,79,235,720,2254,7146,22927,74137,241461,790838,2603210,
%T 8604861,28549166,95027832,317229779,1061764660,3562113987,11976146355
%N Number of generalized polyforms on the snub square tiling with n cells.
%C The generalized polyforms counted by this sequence are "free", which means that they are counted up to rotation and reflection.
%H Peter Kagey, <a href="https://codegolf.stackexchange.com/q/187763/53884">Counting generalized polyominoes</a>
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Snub_square_tiling">Snub square tiling</a>
%Y Cf. A000105, A000228, A000577.
%K nonn
%O 0,2
%A _Peter Kagey_ and Peter Taylor, Jul 15 2019
%E a(19)a(22) from _Christian Sievers_
