Number of 2-anisohedral polyominoes of order n.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =1a(8) =8a(9) =41a(10) =89a(11) =214a(12) =406a(13) =874a(14) =1107a(15) =2210a(16) =1316a(17) =7380a(18) =5450a(19) =18211a(20) =21866a(21) =47702a(22) =10390a(23) =201834a(24) =28784