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 A339704 #5 Dec 14 2020 10:28:44
%S A339704 1,-5,-5,5,-5,20,-5,10,5,20,-5,-5,-5,20,20,-15,-5,-5,-5,-5,20,20,-5,
%T A339704 -55,5,20,10,-5,-5,-55,-5,-6,20,20,20,-45,-5,20,20,-55,-5,-55,-5,-5,
%U A339704 -5,20,-5,20,5,-5,20,-5,-5,-55,20,-55,20,20,-5,-55,-5,20,-5,-5,20,-55,-5,-5,20,-55
%N A339704 Dirichlet g.f.: Product_{k>=2} (1 - k^(-s))^5.
%F A339704 a(1) = 1; a(n) = -Sum_{d|n, d < n} A339320(n/d) * a(d).
%F A339704 a(p^k) = A000728(k) for prime p.
%Y A339704 Cf. A000728, A114592, A339320, A339701, A339702, A339703, A339705, A339706, A339707.
%K A339704 sign
%O A339704 1,2
%A A339704 _Ilya Gutkovskiy_, Dec 13 2020