Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0110-0011 pattern in any orientation.

A146451

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0110-0011 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =11a(8) =23a(9) =43a(10) =147a(11) =439a(12) =1275a(13) =4541a(14) =20063a(15) =98055a(16) =505355a(17) =2950723a(18) =18858815a(19) =128249637a(20) =989759495a(21) =8490117733

External references