This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A292302 #7 Sep 14 2017 09:30:37
%S A292302 1,2,4,4,10,0,22,0,18,2,48,-34,80,-28,18,24,102,-90,160,-112,70,32,
%T A292302 174,-206,220,-50,76,-74,340,-372,490,-248,94,42,84,-232,662,-304,70,
%U A292302 -196,738,-738,904,-586,60,240,642,-966,904,-538,348,-184,1030,-1116,690,-482,552,38,984,-1806
%N A292302 Expansion of (1 - x)*Sum_{k>=1} k*phi(k)*x^k/(1 - x^k), where phi() is the Euler totient function (A000010).
%C A292302 First differences of A057660.
%F A292302 G.f.: (1 - x)*Sum_{k>=1} k*phi(k)*x^k/(1 - x^k).
%t A292302 nmax = 60; Rest[CoefficientList[Series[(1 - x) Sum[EulerPhi[k] k x^k /(1 - x^k), {k, 1, nmax}], {x, 0, nmax}], x]]
%Y A292302 Cf. A057660, A174405.
%K A292302 sign
%O A292302 1,2
%A A292302 _Ilya Gutkovskiy_, Sep 14 2017