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 A303569 #17 Apr 27 2018 10:32:28
%S A303569 1,2,2,80,158,9428,21740,1814144,4326566,480716188,1138919436,
%T A303569 162673628256,377710551084,67537379669352,153236971128120,
%U A303569 33578612305618176,74565718435602822,19669491236331371820,42886189370197775372,13410838610779209885664
%N A303569 a(n) = [x^n] ((Sum_{k=0..n} (k+7)!*x^k)/(Sum_{k=0..n} (k+7)!*(-x)^k))^(1/8).
%H A303569 Seiichi Manyama, <a href="/A303569/b303569.txt">Table of n, a(n) for n = 0..444</a>
%o A303569 (PARI) N=20; x='x+O('x^N); Vec((sum(k=0, N, (k+7)!*x^k)/sum(k=0, N, (k+7)!*(-x)^k))^(1/8))
%Y A303569 Cf. A303565, A303567, A303568, A303614.
%K A303569 nonn
%O A303569 0,2
%A A303569 _Seiichi Manyama_, Apr 26 2018