643500domain: NAppears in sequencesOrdered products of the sides of primitive Pythagorean triangles.at n=22A063011Triangle T(n,k) read by rows = number of partitions of n-set into k blocks with distinct sizes, k = 1..A003056(n).at n=35A131632Number of set partitions of [n] into four blocks with distinct sizes.at n=3A272516