Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-1100 pattern in any orientation.
A147479
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-1100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =9a(8) =20a(9) =33a(10) =56a(11) =123a(12) =372a(13) =1117a(14) =3761a(15) =13503
External references
- oeis: A147479