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 A307837 #6 May 01 2019 09:14:38
%S A307837 1,1,0,1,1,0,0,1,0,1,0,1,0,1,1,1,1,0,0,1,0,1,1,0,-1,-1,-1,2,0,1,0,1,0,
%T A307837 1,0,0,0,1,1,2,1,0,1,0,2,-1,-2,3,-3,-2,1,1,-1,2,3,3,2,3,3,-2,-3,4,4,
%U A307837 -3,-3,-3,4,-3,4,4,-3,4,-5,6,6,-6,8,9,-9,10,-8,-6,-7,8,7,6,5,6,7,-6,-8,-7,6,7,9,9,5,-4,2,-1
%N A307837 a(1) = 1; a(n+1) = Sum_{d|n} lambda(d)*a(d), where lambda = Liouville function (A008836).
%F A307837 G.f.: x * (1 + Sum_{n>=1} lambda(n)*a(n)*x^n/(1 - x^n)).
%t A307837 a[n_] := a[n] = Sum[LiouvilleLambda[d] a[d], {d, Divisors[n - 1]}]; a[1] = 1; Table[a[n], {n, 1, 100}]
%t A307837 a[n_] := a[n] = SeriesCoefficient[x (1 + Sum[LiouvilleLambda[k] a[k] x^k/(1 - x^k), {k, 1, n - 1}]), {x, 0, n}]; Table[a[n], {n, 1, 100}]
%Y A307837 Cf. A001222, A008836, A061020, A070965, A206369.
%K A307837 sign
%O A307837 1,28
%A A307837 _Ilya Gutkovskiy_, May 01 2019