Number of (n+1)X(7+1) 0..3 arrays with every 2X2 subblock summing to 5 6 or 7.

A251380

Number of (n+1)X(7+1) 0..3 arrays with every 2X2 subblock summing to 5 6 or 7.

Terms

    a(0) =55551652a(1) =63575161960

External references