Number of (n+1)X3 0..3 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards.

A204304

Number of (n+1)X3 0..3 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards.

Terms

    a(0) =2400a(1) =51680a(2) =1077978a(3) =15057392a(4) =209106648a(5) =2204400210a(6) =23201606946a(7) =200331995906

External references