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URL: https://oeis.org/A294955

⇱ A294955 - OEIS

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A294955
a(n) = Sum_{d|n} d^(2*n+2).
3
1, 65, 6562, 1049601, 244140626, 78368963450, 33232930569602, 18014467229220865, 12157665462543713203, 10000002384185795209930, 9849732675807611094711842, 11447546167874515876354097130, 15502932802662396215269535105522
OFFSET
1,2
LINKS
FORMULA
G.f.: Sum_{k>0} k^(2*k+2)*x^k/(1-(k^2*x)^k).
PROG
(PARI) {a(n) = sigma(n, 2*n+2)}
(PARI) N=20; x='x+O('x^N); Vec(sum(k=1, N, k^(2*k+2)*x^k/(1-(k^2*x)^k)))
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Nov 12 2017
STATUS
approved