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%I #8 Sep 09 2020 09:55:55
%S 1,1,4,21,296,5677,291348,22679763,3946629792,1281287791090,
%T 840017139222515,1068253745514088673,2745322115165570881474,
%U 14006438682727577999625359,141884380264686466724199980066,2897075017978846591982107951045864,118770312781918226439371316982748736112
%N a(n) = [x^n] exp(Sum_{k>=1} sigma(k^n)*x^k/k).
%H Seiichi Manyama, <a href="/A319363/b319363.txt">Table of n, a(n) for n = 0..80</a>
%t Table[SeriesCoefficient[Exp[Sum[DivisorSigma[1, k^n] x^k/k, {k, 1, n}]], {x, 0, n}], {n, 0, 16}]
%Y Cf. A000041, A156303, A156304, A202993, A203557, A319362.
%K nonn
%O 0,3
%A _Ilya Gutkovskiy_, Sep 17 2018
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