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

A238250

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

Terms

    a(0) =121a(1) =804a(2) =6828a(3) =43456a(4) =284992a(5) =1473792a(6) =7616082a(7) =32986844a(8) =142361644a(9) =537301496a(10) =2020791427a(11) =6843417893a(12) =23099713493a(13) =71683038307a(14) =221767602558a(15) =640525984280

External references