Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 00100-00100-11111 pattern in any orientation.
A146997
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 00100-00100-11111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =6a(7) =1a(8) =15a(9) =1a(10) =79a(11) =13a(12) =545a(13) =41a(14) =5277a(15) =308a(16) =66438a(17) =2695a(18) =1162610a(19) =29727a(20) =27605281a(21) =454197a(22) =898228670a(23) =10169685a(24) =40179297824a(25) =297550563
External references
- oeis: A146997