71528domain: NAppears in sequencesNumber of 5-tuples of different integers from [ 1,n ] with no common factors among triples.at n=30A015646Number of polydiamonds: polyforms made from n diamonds.at n=7A056844Expansion of f(q) * f(q^5) / phi(-q^2)^2 in powers of q where f(), phi() are Ramanujan theta functions.at n=34A145722