Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 11110-01111 pattern in any orientation.
A147507
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 11110-01111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =25a(11) =25a(12) =141a(13) =141a(14) =673a(15) =673a(16) =9515a(17) =9515a(18) =128879a(19) =128879a(20) =2409621a(21) =2409621a(22) =79940355a(23) =79940355
External references
- oeis: A147507