Number of 4 X 9 matrices with elements in 0..n with each row and each column in nondecreasing order. 4,9,n can be permuted, see formula.

A140919

Number of 4 X 9 matrices with elements in 0..n with each row and each column in nondecreasing order. 4,9,n can be permuted, see formula.

Terms

    a(0) =1a(1) =715a(2) =143143a(3) =13026013a(4) =677352676a(5) =23029990984a(6) =559299781040

External references