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

A190417

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

Terms

    a(0) =45a(1) =497a(2) =9580a(3) =319760a(4) =18980021a(5) =1980733945a(6) =363632891784

External references