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%I #14 Mar 24 2021 08:47:32
%S 1,1,4,-1,6,4,8,-25,37,16,12,-106,14,92,384,-561,18,-65,20,-706,2552,
%T 1948,24,-15658,3151,8048,20440,-2570,30,-33326,32,-135393,178512,
%U 130816,94968,-583219,38,523964,1596560,-2465370,42,-2521186,44,-15082,16364502,8388124,48,-78560082,823593,23888231
%N a(n) = -Sum_{d|n} (-n/d)^d.
%H Seiichi Manyama, <a href="/A076717/b076717.txt">Table of n, a(n) for n = 1..5000</a>
%F G.f.: Sum_{n>0} n*x^n/(1+n*x^n).
%o (PARI) a(n) = -sumdiv(n, d, (-n/d)^d); \\ _Michel Marcus_, Mar 22 2021
%Y Cf. A055225, A308367, A321438.
%K sign
%O 1,3
%A _Vladeta Jovovic_, Oct 27 2002
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