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 A347900 #9 Sep 18 2021 11:38:14
%S A347900 1,0,2,0,36,-30,1384,-1680,95120,-269136,10673176,-39346560,
%T A347900 1646512480,-9198926880,351447935136,-2475812561040,99060435898112,
%U A347900 -904912972938240,34772619691749120,-378998950170136320,14965802767502028672,-197854178189523770880,7940955462403332290816
%N A347900 E.g.f.: Product_{k>=1} (1 + x^k)^(tan(x)/k).
%o A347900 (PARI) N=40; x='x+O('x^N); Vec(serlaplace(prod(k=1, N, (1+x^k)^(tan(x)/k))))
%Y A347900 Cf. A347898, A347899.
%K A347900 sign
%O A347900 0,3
%A A347900 _Seiichi Manyama_, Sep 18 2021