Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-0011 pattern in any orientation.
A147461
Number of n X n binary arrays symmetric under horizontal reflection 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) =1a(6) =9a(7) =11a(8) =153a(9) =277a(10) =1847a(11) =3941a(12) =42907a(13) =102189a(14) =2677867a(15) =7544909a(16) =418620919a(17) =1424570893a(18) =112979816299a(19) =454603733387
External references
- oeis: A147461