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 A339703 #5 Dec 14 2020 10:28:38
%S A339703 1,-4,-4,2,-4,12,-4,8,2,12,-4,4,-4,12,12,-5,-4,4,-4,4,12,12,-4,-28,2,
%T A339703 12,8,4,-4,-20,-4,-4,12,12,12,-26,-4,12,12,-28,-4,-20,-4,4,4,12,-4,-8,
%U A339703 2,4,12,4,-4,-28,12,-28,12,12,-4,-44,-4,12,4,-10,12,-20,-4,4,12,-20
%N A339703 Dirichlet g.f.: Product_{k>=2} (1 - k^(-s))^4.
%F A339703 a(1) = 1; a(n) = -Sum_{d|n, d < n} A339319(n/d) * a(d).
%F A339703 a(p^k) = A000727(k) for prime p.
%Y A339703 Cf. A000727, A114592, A339319, A339701, A339702, A339704, A339705, A339706, A339707.
%K A339703 sign
%O A339703 1,2
%A A339703 _Ilya Gutkovskiy_, Dec 13 2020