Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0100-1111 pattern in any orientation.
A146657
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0100-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =13a(6) =49a(7) =241a(8) =1117a(9) =5505a(10) =34113a(11) =304743a(12) =3090983a(13) =40451327a(14) =642013469a(15) =12875896245
External references
- oeis: A146657