Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-1111 pattern in any orientation.
A146740
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =25a(9) =25a(10) =197a(11) =197a(12) =1317a(13) =1317a(14) =27967a(15) =27967a(16) =769895a(17) =769895a(18) =31824755a(19) =31824755a(20) =2225324253a(21) =2225324253
External references
- oeis: A146740