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 A308397 #7 May 25 2019 02:28:58
%S A308397 1,1,-1,-5,7,71,-59,-1511,-9295,-1583,861751,4039091,-80670281,
%T A308397 -606807785,7674244397,78614840641,1146707474401,12874145737889,
%U A308397 -1054507266321425,-19048413877999253,238097060642380391,6646823785301856871,-59731575523361439851,-2231444370433747995415
%N A308397 Expansion of e.g.f. exp(Sum_{k>=1} x^(k^2)*(1 - x^(k^2))/k^2).
%F A308397 E.g.f.: Product_{k>=1} (1 + x^k)^(lambda(k)/k), where lambda() is the Liouville function (A008836).
%t A308397 nmax = 23; CoefficientList[Series[Exp[Sum[x^(k^2) (1 - x^(k^2))/k^2, {k, 1, nmax}]], {x, 0, nmax}], x] Range[0, nmax]!
%t A308397 nmax = 23; CoefficientList[Series[Product[(1 + x^k)^(LiouvilleLambda[k]/k), {k, 1, nmax}], {x, 0, nmax}], x] Range[0, nmax]!
%Y A308397 Cf. A008836, A118207, A190585, A205801, A306831, A308396, A308398.
%K A308397 sign
%O A308397 0,4
%A A308397 _Ilya Gutkovskiy_, May 24 2019