Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 111-110-111 pattern in any orientation.
A146286
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 111-110-111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =13a(8) =29a(9) =41a(10) =99a(11) =219a(12) =653a(13) =1719a(14) =7125a(15) =30115a(16) =144385a(17) =515791a(18) =2502679a(19) =10851481a(20) =66672841a(21) =362202203a(22) =2693814149a(23) =19415112859a(24) =179313023913
External references
- oeis: A146286