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

A190421

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

Terms

    a(0) =41a(1) =418a(2) =7196a(3) =204512a(4) =10058896a(5) =841847949a(6) =119691599225

External references