Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0010-1010-1111 pattern in any orientation.
A146777
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0010-1010-1111 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) =49a(11) =49a(12) =205a(13) =205a(14) =3001a(15) =3001a(16) =66003a(17) =66003a(18) =1489297a(19) =1489297a(20) =39955495a(21) =39955495
External references
- oeis: A146777