Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1100-0111-0010 pattern in any orientation.
A147047
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1100-0111-0010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =5a(6) =5a(7) =9a(8) =25a(9) =73a(10) =125a(11) =433a(12) =1109a(13) =4789a(14) =15605a(15) =79281a(16) =298381a(17) =1737861a(18) =8105277a(19) =59580321a(20) =339696501a(21) =2994804821a(22) =20458651317a(23) =215020666113
External references
- oeis: A147047