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 A087961 #3 Mar 30 2012 18:36:39 %S A087961 1,1,-1,10,-159,3816,-125375,5309088,-278224975,17527766896, %T A087961 -1298909663199,111339963135600,-10892621058454487, %U A087961 1203078692663183064,-148666849777064966815,20397978159874089501496 %N A087961 Satisfies f(x*f(x)) = exp(x), where f(x)=sum(n=0,infinity, a(n)*x^n/n!). %e A087961 f(x) = 1 +1x -1x^2/2! +10x^3/3! -159x^4/4! +3816x^5/5! -125375x^6/6! +-... %e A087961 where f(x*f(x)) = exp(x). %K A087961 sign %O A087961 0,4 %A A087961 _Paul D. Hanna_, Sep 18 2003