Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-1111 pattern in any orientation.
A146229
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =3a(11) =3a(12) =13a(13) =13a(14) =37a(15) =37a(16) =183a(17) =183a(18) =817a(19) =817a(20) =5601a(21) =5601a(22) =59649a(23) =59649
External references
- oeis: A146229