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 A193468 #9 Nov 05 2024 18:59:10
%S A193468 1,1,3,21,193,2125,32281,655235,15530705,427214889,14127457681,
%T A193468 542796582295,23400843532969,1140401734145453,62743287535847465,
%U A193468 3822548966261363595,256275705820386124321,18923726002188870476497
%N A193468 a(n) = A193466(n)/n for n>=1.
%C A193468 A193466 is defined by the e.g.f.: Sum_{n>=0} x^n * Product_{k=1..n} cosh(k*x).
%o A193468 (PARI) {a(n)=local(X=x+x*O(x^n), Egf); Egf=sum(m=0, n, x^m*prod(k=1, m, cosh(k*X))); if(n<1,0,(n-1)!*polcoeff(Egf, n))}
%Y A193468 Cf. A193467.
%K A193468 nonn
%O A193468 1,3
%A A193468 _Paul D. Hanna_, Jul 27 2011