Number of (n+1)X4 0..2 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards.

A204225

Number of (n+1)X4 0..2 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards.

Terms

    a(0) =2500a(1) =44641a(2) =752562a(3) =8183170a(4) =87487117a(5) =694547816a(6) =5466340007a(7) =34834605810a(8) =220710753856

External references