Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-1111 pattern in any orientation.
A146385
Number of n X n binary arrays symmetric about both diagonal and antidiagonal 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) =2a(6) =3a(7) =6a(8) =11a(9) =18a(10) =47a(11) =140a(12) =456a(13) =1541a(14) =4859a(15) =19189a(16) =88716a(17) =477610a(18) =2733493a(19) =16377324a(20) =107101430a(21) =821473645a(22) =7043526337a(23) =68487711150a(24) =704897480220
External references
- oeis: A146385