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 A013469 #4 Feb 24 2012 12:51:30 %S A013469 1,-2,12,-122,1792,-35282,889152,-27747722,1045556992,-46640267042, %T A013469 2424156352512,-144890071612442,9849171061952512,-754330752297972722, %U A013469 64566114865428283392 %N A013469 exp(cos(x)-cosh(x))=1-2/2!*x^2+12/4!*x^4-122/6!*x^6+1792/8!*x^8... %K A013469 sign %O A013469 0,2 %A A013469 Patrick Demichel (patrick.demichel(AT)hp.com)