67385domain: NAppears in sequencesa(n) = [x^n] Product_{k=1..n} 1/(x^(3*k)*(1-x^k)^3).at n=3A258796a(n) is the least k such that in the prime power factorization of k! the exponents of primes p_1, ..., p_n are odd, while the exponent of p_(n+1) is even.at n=14A321362