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 A229263 #9 Mar 21 2016 06:42:34
%S A229263 1,1,13,541,32761,3782521,570649861,126354119893,34059666142321,
%T A229263 12697511966492401,5418397453551516541,2950382131846118771341,
%U A229263 1848796902719228099999593,1394126061848631877574788201,1187817128863650862040235107701,1196980698779612997551160117313861
%N A229263 E.g.f.: Product_{n>=1} cosh(x^n).
%H A229263 Vaclav Kotesovec, <a href="/A229263/b229263.txt">Table of n, a(n) for n = 0..220</a>
%e A229263 E.g.f.: A(x) = 1 + x^2/2! + 13*x^4/4! + 541*x^6/6! + 32761*x^8/8! +...
%e A229263 where
%e A229263 A(x) = cosh(x)*cosh(x^2)*cosh(x^3)*cosh(x^4)*cosh(x^5)*cosh(x^6)*...
%o A229263 (PARI) {a(n)=(2*n)!*polcoeff(prod(m=1,n,cosh(x^m +x*O(x^(2*n)))),2*n)}
%o A229263 for(n=0,20,print1(a(n),", "))
%Y A229263 Cf. A000262, A270294, A270662, A270663.
%K A229263 nonn
%O A229263 0,3
%A A229263 _Paul D. Hanna_, Sep 18 2013