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 A339716 #4 Dec 14 2020 16:00:40
%S A339716 1,-9,-9,27,-9,72,-9,-12,27,72,-9,-171,-9,72,72,-90,-9,-171,-9,-171,
%T A339716 72,72,-9,-63,27,72,-12,-171,-9,-495,-9,135,72,72,72,189,-9,72,72,-63,
%U A339716 -9,-495,-9,-171,-171,72,-9,747,27,-171,72,-171,-9,-63,72,-63,72,72,-9,801
%N A339716 Dirichlet g.f.: Product_{k>=2} (1 - k^(-s))^9.
%F A339716 a(1) = 1; a(n) = -Sum_{d|n, d < n} A339324(n/d) * a(d).
%F A339716 a(p^k) = A010817(k) for prime p.
%Y A339716 Cf. A010817, A114592, A339324, A339701, A339702, A339703, A339704, A339705, A339706, A339707.
%K A339716 sign
%O A339716 1,2
%A A339716 _Ilya Gutkovskiy_, Dec 14 2020