Number of 3 X 9 matrices with elements in 0..n with each row and each column in nondecreasing order. 3,9,n can be permuted, see formula.
A140918
Number of 3 X 9 matrices with elements in 0..n with each row and each column in nondecreasing order. 3,9,n can be permuted, see formula.
Terms
- a(0) =1a(1) =220a(2) =15730a(3) =572572a(4) =13026013a(5) =208416208a(6) =2530768240a(7) =24584605760a(8) =198520691512
External references
- oeis: A140918