Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1101-0111 pattern in any orientation.
A147166
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1101-0111 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) =123a(13) =369a(14) =1165a(15) =4187a(16) =18445a(17) =79415a(18) =399577a(19) =2091817a(20) =12535539a(21) =80500731
External references
- oeis: A147166