21026304

Appears in sequences

• a(n) = n^5*(n+1)^2/2.at n=12A163275
• a(n) = Product_{d|n} (tau(d)*sigma(d)) where tau(k) = the number of divisors of k (A000005) and sigma(k) = the sum of the divisors of k (A000203).at n=17A324987