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

A190418

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

Terms

    a(0) =37a(1) =290a(2) =4174a(3) =103218a(4) =4268160a(5) =302857233a(6) =36530501839

External references