Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0100-0111 pattern in any orientation.
A146439
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0100-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =17a(9) =17a(10) =57a(11) =57a(12) =337a(13) =337a(14) =4357a(15) =4357a(16) =135183a(17) =135183a(18) =3521533a(19) =3521533a(20) =135176521a(21) =135176521a(22) =9933992919
External references
- oeis: A146439