135745domain: NAppears in sequencesNumber of ordered 5-tuples of integers from [ 2,n ] with no common factors among triples.at n=32A0156571000-gonal numbers: a(n) = n*(499*n - 498).at n=17A195163G.f. A(x) satisfies A(x) = (1 + x*A(x) / (1+x))^5.at n=6A371544