Number of nX6 nonnegative integer arrays each row and column an ascent sequence (interior element no greater than one plus up-steps preceding it) and the lower right element equal to min(n,6)-1.

A202733

Number of nX6 nonnegative integer arrays each row and column an ascent sequence (interior element no greater than one plus up-steps preceding it) and the lower right element equal to min(n,6)-1.

Terms

    a(0) =1a(1) =16a(2) =406a(3) =10296a(4) =97794a(5) =44976a(6) =182593546a(7) =171227525652

External references