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 A308398 #6 May 25 2019 02:29:06
%S A308398 1,-1,3,-7,19,-51,61,167,6777,-107929,1650691,-17839911,157217083,
%T A308398 -1229269627,6185945949,-3251776921,-1151787785999,10138302541647,
%U A308398 532690324952707,-14122245788830279,443912721023736291,-7480012715591067331,115775303074594208893,-1392396864130912381017
%N A308398 Expansion of e.g.f. exp(Sum_{k>=1} x^(k^2)*(x^(k^2) - 1)/k^2).
%F A308398 E.g.f.: Product_{k>=1} 1/(1 + x^k)^(lambda(k)/k), where lambda() is the Liouville function (A008836).
%t A308398 nmax = 23; CoefficientList[Series[Exp[Sum[x^(k^2) (x^(k^2) - 1)/k^2, {k, 1, nmax}]], {x, 0, nmax}], x] Range[0, nmax]!
%t A308398 nmax = 23; CoefficientList[Series[Product[1/(1 + x^k)^(LiouvilleLambda[k]/k), {k, 1, nmax}], {x, 0, nmax}], x] Range[0, nmax]!
%Y A308398 Cf. A008836, A118208, A190585, A205801, A306831, A308396, A308397.
%K A308398 sign
%O A308398 0,3
%A A308398 _Ilya Gutkovskiy_, May 24 2019