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 A047689 #8 Mar 07 2020 01:53:18 %S A047689 1,-1,1,-31,379,-1639,150349,-4373461,39074491,-6698486371, %T A047689 30708135509,-4934550701809,1319703681935929,-99896787342523081, %U A047689 2121075416425574701,-72929243565543262421,83877585692383961052499,-2410048463569672917849859 %N A047689 Numerators of coefficients in Taylor series for exp(cos(x)-1). %D A047689 CRC Standard Mathematical Tables and Formulae, 30th ed. 1996, p. 42. %e A047689 1 - (1/2)*x^2 + (1/6)*x^4 - (31/720)*x^6 + (379/40320)*x^8 - (1639/907200)*x^10 + ... %Y A047689 Cf. A047690, A005046. %K A047689 sign,easy,frac %O A047689 0,4 %A A047689 _N. J. A. Sloane_