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 A009200 #20 Apr 01 2017 12:31:10
%S A009200 1,1,0,-1,2,-4,16,-120,1084,-10568,111196,-1269764,15728360,
%T A009200 -210510936,3029497472,-46654106824,765497451536,-13330741903360,
%U A009200 245546485746064,-4769321293582128,97417091239222336,-2087367002843576384,46814167766826521920,-1096698328458955351616
%N A009200 E.g.f. exp(sin(log(1+x))).
%F A009200 a(n) = Sum_{k=1..n} stirling1(n,k)*A002017(k), n > 0, a(0)=1. - _Vladimir Kruchinin_, Jun 29 2011
%o A009200 (PARI) x='x+O('x^30); Vec(serlaplace(exp(sin(log(1+x))))) \\ _Michel Marcus_, Apr 01 2017
%Y A009200 Cf. A002017.
%K A009200 sign,easy
%O A009200 0,5
%A A009200 _R. H. Hardin_
%E A009200 Extended with signs by _Olivier Gérard_, Mar 15 1997