Number of (n+2) X (n+2) symmetric binary matrices without the pattern 0 1 1 diagonally.

A190535

Number of (n+2) X (n+2) symmetric binary matrices without the pattern 0 1 1 diagonally.

Terms

    a(0) =56a(1) =672a(2) =13440a(3) =443520a(4) =23950080a(5) =2107607040a(6) =301387806720

External references