Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0111 pattern in any orientation.

A146475

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0111 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =9a(7) =15a(8) =35a(9) =57a(10) =245a(11) =579a(12) =3057a(13) =8465a(14) =49975a(15) =173815a(16) =1305505a(17) =5674409a(18) =52338659a(19) =276967501a(20) =3125019047a(21) =20455456921a(22) =286529633207

External references