Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-111 pattern in any orientation.
A146278
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =17a(8) =29a(9) =45a(10) =101a(11) =297a(12) =821a(13) =2819a(14) =10635a(15) =50419a(16) =205159a(17) =928911a(18) =4321051a(19) =24702095a(20) =144781137a(21) =1031901327a(22) =7307383577a(23) =64959695293a(24) =541722263927
External references
- oeis: A146278