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 A138730 #9 May 13 2013 01:48:48
%S A138730 0,190,1,4,2,1,1,1,6,10,6,6,1,3,2,9,67,2,3,1,7,1,2,1,1,1,2,1,1,4,1,68,
%T A138730 5,6,1,1,1,4,1,1,5,1,4,8,2,5,5,1,1,3,1,2,2,6,1,1,1,9,2,1,1,1,17,5,21,
%U A138730 2,9,1,3,1,2,4,1,3,5,1,56,1,4,14,5,17,4,2,34,1,18,1,1,4,1,5,16,1,3,27,1,11
%N A138730 Continued fraction for 4th Du Bois Reymond constant.
%t A138730 ContinuedFraction[FullSimplify[TrigToExp[ -3 - 2Residue[x^2/((Tan[x] - x) (1 + x^2)^2), {x, I}]]], 100](*Artur Jasinski*)
%o A138730 (PARI) contfrac((exp(4)-4*exp(2)-25)/8) \\ _Charles R Greathouse IV_, Feb 24 2012
%Y A138730 Cf. A207528, A062545, A062546, A085466, A085467, A138729, A138730, A138731, A138732, A138733.
%K A138730 nonn,cofr
%O A138730 1,2
%A A138730 _Artur Jasinski_, Mar 26 2008