Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1111-0010 pattern in any orientation.
A147113
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1111-0010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =5a(8) =23a(9) =49a(10) =83a(11) =217a(12) =723a(13) =2201a(14) =7571a(15) =32315a(16) =154081a(17) =841887a(18) =4456709a(19) =26183699a(20) =165757037
External references
- oeis: A147113