A174471 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

LINKS

Table of n, a(n) for n=0..14.

PROG

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

CROSSREFS

Cf. A174472, A000203 (sigma).

Sequence in context: A363314 A203112 A349099 * A275233 A359971 A043068

Adjacent sequences: A174468 A174469 A174470 * A174472 A174473 A174474

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Apr 04 2010

STATUS

approved