Number of fixed polyominoes that can produce a repeating phenotype with 1, 2, or 4 90-degree turns.

Terms

a(0) =1a(1) =1a(2) =1a(3) =0a(4) =2a(5) =2a(6) =0a(7) =2a(8) =6a(9) =1a(10) =7a(11) =19a(12) =1a(13) =7a(14) =63a(15) =0a(16) =16a(17) =216a(18) =0a(19) =16a(20) =760a(21) =3a(22) =49a(23) =2725a(24) =2a(25) =48a(26) =9910a(27) =0a(28) =158a(29) =36446