Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0010 pattern in any orientation.
A146403
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =7a(7) =19a(8) =47a(9) =85a(10) =259a(11) =857a(12) =3329a(13) =13923a(14) =76419a(15) =375879a(16) =2500865a(17) =15196877a(18) =126783213a(19) =979497309a(20) =10344645479a(21) =100578970271
External references
- oeis: A146403