Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1101-0111-0001 pattern in any orientation.
A147238
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1101-0111-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =21a(6) =51a(7) =289a(8) =1391a(9) =7677a(10) =54075a(11) =500683a(12) =5608015a(13) =82262213a(14) =1433087781
External references
- oeis: A147238