Number of 6 X 9 matrices with elements in 0..n with each row and each column in nondecreasing order. 6,9,n can be permuted, see formula.
A140921
Number of 6 X 9 matrices with elements in 0..n with each row and each column in nondecreasing order. 6,9,n can be permuted, see formula.
Terms
- a(0) =1a(1) =5005a(2) =5725720a(3) =2530768240a(4) =559299781040
External references
- oeis: A140921