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 A270598 #6 Mar 20 2016 11:36:56
%S A270598 1,1,1,3,14,70,364,2548,21104,189936,1830968,20140648,241712272,
%T A270598 3142259536,43472528384,652087925760,10396900456448,176747307759616,
%U A270598 3162885135453952,60094817573625088,1198006583353972736,25158138250433427456,551506339507727783936
%N A270598 E.g.f.: Product_{k>0} (1 + tanh(x^k/k)).
%H A270598 Vaclav Kotesovec, <a href="/A270598/b270598.txt">Table of n, a(n) for n = 0..448</a>
%F A270598 E.g.f.: Product_{k>0} exp(x^k/k)/cosh(x^k/k).
%F A270598 a(n) ~ c * n!, where c = 1/A249673 = 1/Product_{k>=1} cosh(1/k) = 0.472485841489...
%t A270598 nn=25; Range[0, nn]! * CoefficientList[Series[Product[1+Tanh[x^k/k], {k, 1, nn}], {x, 0, nn}], x]
%Y A270598 Cf. A130263, A130268, A218504, A270597.
%K A270598 nonn
%O A270598 0,4
%A A270598 _Vaclav Kotesovec_, Mar 20 2016