337767408000domain: NAppears in sequences7-fold factorials: a(n) = Product_{k=0..n-1} (7*k+1).at n=9A045754Triangle, read by rows, T(n,k) = k^(n+1) * Pochhammer(1/k, n+1).at n=34A153274a(n) = Product_{k=1..n} (n*k-k+1).at n=8A382532