30107635272domain: NAppears in sequencesa(n) = Product_{i=1..n} ((i+5)*(i+6)*(i+7)*(i+8)*(i+9))/(i*(i+1)*(i+2)*(i+3)*(i+4)).at n=7A047831Number of 5 X 7 matrices with elements in 0..n with each row and each column in nondecreasing order. 5,7,n can be permuted, see formula.at n=5A140909