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 A339706 #5 Dec 14 2020 10:28:56
%S A339706 1,-7,-7,14,-7,42,-7,7,14,42,-7,-56,-7,42,42,-49,-7,-56,-7,-56,42,42,
%T A339706 -7,-105,14,42,7,-56,-7,-203,-7,21,42,42,42,-35,-7,42,42,-105,-7,-203,
%U A339706 -7,-56,-56,42,-7,238,14,-56,42,-56,-7,-105,42,-105,42,42,-7,91,-7,42,-56,35,42
%N A339706 Dirichlet g.f.: Product_{k>=2} (1 - k^(-s))^7.
%F A339706 a(1) = 1; a(n) = -Sum_{d|n, d < n} A339322(n/d) * a(d).
%F A339706 a(p^k) = A000730(k) for prime p.
%Y A339706 Cf. A000730, A114592, A339322, A339701, A339702, A339703, A339704, A339705, A339707.
%K A339706 sign
%O A339706 1,2
%A A339706 _Ilya Gutkovskiy_, Dec 13 2020