A174471 G.f.: exp( Sum_{n>=1} A174472(n)*x^n/n ) where A174472(n) = Sum_{d|n} d^sigma(d).

1, 1, 5, 32, 4138, 7371, 362821209, 363768114, 4399869984980, 4692111613957, 100023774005024513, 100145112875103405, 137370551968043406735177291498, 137370551970759432867153686743, 687082347540023318264721577813

Offset: 0

Author

Paul D. Hanna, Apr 04 2010

Keywords

• nonn

Crossrefs

Cf. A174472, A000203 (sigma).

Programs

PARI

{a(n)=polcoeff(exp(sum(m=1,n,x^m/m*sumdiv(m,d,d^sigma(d)))+x*O(x^n)),n)}