Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-100-111 pattern in any orientation.
A146175
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-100-111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =5a(8) =13a(9) =25a(10) =45a(11) =121a(12) =385a(13) =1395a(14) =5901a(15) =28053a(16) =137719a(17) =714777a(18) =4090907a(19) =28017605a(20) =214429525a(21) =1879119265a(22) =18054271787a(23) =200571323617
External references
- oeis: A146175