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A319362
a(n) = [x^n] exp(Sum_{k>=1} sigma(n*k)*x^k/k).
2
1, 1, 8, 39, 385, 917, 31247, 22527, 1081986, 2464860, 50099635, 14931071, 19684696065, 394805109, 82267017929, 496514888157, 11386442827781, 284625019799, 3469798073972537, 7725084195239, 136470024990370842, 28400489198168457, 241211623942678951, 5776331152550399
OFFSET
0,3
LINKS
MATHEMATICA
Table[SeriesCoefficient[Exp[Sum[DivisorSigma[1, n k] x^k/k, {k, 1, n}]], {x, 0, n}], {n, 0, 23}]
KEYWORD
nonn,look
AUTHOR
Ilya Gutkovskiy, Sep 17 2018
STATUS
approved