Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.
A147265
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =5a(9) =13a(10) =25a(11) =47a(12) =157a(13) =479a(14) =1191a(15) =4193a(16) =22021a(17) =114523a(18) =544473a(19) =2865365a(20) =19090211a(21) =131534115
External references
- oeis: A147265