Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1100-0111 pattern in any orientation.
A146692
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1100-0111 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) =3641a(15) =3641a(16) =94309a(17) =94309a(18) =2415539a(19) =2415539a(20) =84963203a(21) =84963203
External references
- oeis: A146692