Number of (n+2) X (n+2) symmetric binary matrices without the pattern 1 1 1 diagonally, vertically, antidiagonally or horizontally.

A190422

Number of (n+2) X (n+2) symmetric binary matrices without the pattern 1 1 1 diagonally, vertically, antidiagonally or horizontally.

Terms

    a(0) =34a(1) =254a(2) =3444a(3) =76352a(4) =2733816a(5) =163925231a(6) =16307921090

External references