|
%I #16 Nov 14 2017 09:57:57
%S 1,65,6562,1049601,244140626,78368963450,33232930569602,
%T 18014467229220865,12157665462543713203,10000002384185795209930,
%U 9849732675807611094711842,11447546167874515876354097130,15502932802662396215269535105522
%N a(n) = Sum_{d|n} d^(2*n+2).
%H Seiichi Manyama, <a href="/A294955/b294955.txt">Table of n, a(n) for n = 1..213</a>
%F G.f.: Sum_{k>0} k^(2*k+2)*x^k/(1-(k^2*x)^k).
%o (PARI) {a(n) = sigma(n, 2*n+2)}
%o (PARI) N=20; x='x+O('x^N); Vec(sum(k=1, N, k^(2*k+2)*x^k/(1-(k^2*x)^k)))
%Y Cf. A294645, A294810, A294953, A294954.
%K nonn
%O 1,2
%A _Seiichi Manyama_, Nov 12 2017
| 