Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0011 pattern in any orientation.
A147215
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0011 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =17a(8) =41a(9) =71a(10) =215a(11) =773a(12) =2523a(13) =9517a(14) =44347a(15) =255961a(16) =1482711a(17) =8989887a(18) =64060215a(19) =492775957a(20) =4232478379
External references
- oeis: A147215