Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-1111 pattern in any orientation.
A146387
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =4a(6) =7a(7) =18a(8) =33a(9) =62a(10) =229a(11) =826a(12) =2874a(13) =11455a(14) =45319a(15) =227245a(16) =1250786a(17) =7902554a(18) =51293369a(19) =381222454a(20) =3041924174a(21) =28668489843a(22) =286940122325
External references
- oeis: A146387