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 A270664 #5 Mar 21 2016 07:18:16
%S A270664 1,1,2,10,48,336,2400,22240,220416,2496256,30286080,411725568,
%T A270664 6004838400,94609106944,1588301524992,28577718427648,546685777182720,
%U A270664 11027370474504192,234498341381603328,5253826506085629952,123695389756163358720,3039894623920125116416
%N A270664 E.g.f.: Product_{k>=1} (1 + tanh(x^k)).
%t A270664 nmax = 25; Range[0, nmax]! * CoefficientList[Series[Product[(1+Tanh[x^k]), {k, 1, nmax}], {x, 0, nmax}], x]
%Y A270664 Cf. A130263, A270294, A270598, A270662, A270665, A270666.
%K A270664 nonn
%O A270664 0,3
%A A270664 _Vaclav Kotesovec_, Mar 21 2016