60963840000domain: NAppears in sequencesTriangle of numbers n!(n-1)!...(n-k+1)!/(1!2!...k!).at n=40A009963a(n) = n! * (n+1)! * (n+2)! * (n+3)! / (2! * 3! * 4!).at n=4A010798Coefficient of x^0 in P(n,x) = (Product_{i=0..n-1} i!^2)/matdet(M(n)) of degree n^2 where M(n) is the n X n matrix m(i,j) = 1/(i+j+x).at n=4A079478