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 A009342 #11 Jun 22 2015 22:17:52 %S A009342 0,1,-1,-2,10,-20,-16,488,-4080,22160,-7936,-1616672,22996480, %T A009342 -172976960,-22368256,25518205568,-485458114560,4964227109120, %U A009342 -209865342976,-1231298393825792,29816107240652800,-379260096755225600 %N A009342 Expansion of log(1+sin(x)/cosh(x)). %t A009342 Log[ 1+Sin[ x ]/Cosh[ x ] ] %Y A009342 Cf. A012816. %K A009342 sign,easy %O A009342 0,4 %A A009342 _R. H. Hardin_ %E A009342 Extended with signs by _Olivier Gérard_, Mar 15 1997