Number of (n+1)X(2+1) 0..3 arrays with 2X2 subblock sums lexicographically nondecreasing columnwise and rowwise.

A235259

Number of (n+1)X(2+1) 0..3 arrays with 2X2 subblock sums lexicographically nondecreasing columnwise and rowwise.

Terms

    a(0) =2400a(1) =75744a(2) =2691067a(3) =64470056a(4) =1538378437a(5) =27988093692a(6) =507441199620

External references