Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.
A147105
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =13a(9) =21a(10) =51a(11) =105a(12) =313a(13) =705a(14) =2345a(15) =6341a(16) =26177a(17) =91001a(18) =474255a(19) =1837677a(20) =10745995a(21) =49191077a(22) =334389565a(23) =1781473499
External references
- oeis: A147105