Number of polyominoes with n cells that tile the plane by 180-degree rotation (Conway criterion).

A075202

Number of polyominoes with n cells that tile the plane by 180-degree rotation (Conway criterion).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =12a(5) =35a(6) =101a(7) =320a(8) =960a(9) =2701a(10) =6164a(11) =19770a(12) =34918a(13) =94023a(14) =232714a(15) =462463a(16) =770010a(17) =2462890a(18) =3247171a(19) =9756012a(20) =18463420a(21) =32963374a(22) =51599559a(23) =177923609a(24) =236127160

External references