Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-0011 pattern in any orientation.
A147466
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-0011 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =9a(6) =21a(7) =63a(8) =297a(9) =1127a(10) =5413a(11) =31109a(12) =218667a(13) =1954511a(14) =18966855a(15) =237663851a(16) =3316716099a(17) =56055493989
External references
- oeis: A147466