A319363 - OEIS

A319363

a(n) = [x^n] exp(Sum_{k>=1} sigma(k^n)*x^k/k).

1, 1, 4, 21, 296, 5677, 291348, 22679763, 3946629792, 1281287791090, 840017139222515, 1068253745514088673, 2745322115165570881474, 14006438682727577999625359, 141884380264686466724199980066, 2897075017978846591982107951045864, 118770312781918226439371316982748736112

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OFFSET

0,3

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..80

MATHEMATICA

Table[SeriesCoefficient[Exp[Sum[DivisorSigma[1, k^n] x^k/k, {k, 1, n}]], {x, 0, n}], {n, 0, 16}]

CROSSREFS

Cf. A000041, A156303, A156304, A202993, A203557, A319362.

Sequence in context: A198050 A270482 A126458 * A270586 A048164 A118909

Adjacent sequences: A319360 A319361 A319362 * A319364 A319365 A319366

KEYWORD

nonn

AUTHOR

Ilya Gutkovskiy, Sep 17 2018

STATUS

approved