Number of (1+2)X(n+2) 0..3 arrays with no increasing sequence of length 3 horizontally, vertically or antidiagonally downwards.

A233802

Number of (1+2)X(n+2) 0..3 arrays with no increasing sequence of length 3 horizontally, vertically or antidiagonally downwards.

Terms

    a(0) =169840a(1) =7949773a(2) =371832256a(3) =17394286865a(4) =812933550972

External references