116844domain: NAppears in sequencesa(n) = (n+1)*(n+2)*(n+3)*(n+4)*(5*n^2 + 19*n + 15)/360.at n=12A107963Numbers that are equal to the product of the numerator and denominator of the harmonic mean of their divisors.at n=15A348828Expansion of 1/(Sum_{k>=0} x^(k^2))^2.at n=41A363774