136877

Appears in sequences

• Sum of the second moments of all partitions of n with weights starting from 0.at n=20A066188
• L.g.f.: Sum_{n>=1} (Sum_{d|n} d*x^d)^n/n = Sum_{n>=1} a(n)*x^n/n.at n=14A192859
• a(n) = n*(7*n^2 - 3*n - 1)/3.at n=39A214659