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 A138731 #5 May 13 2013 01:48:48
%S A138731 0,4531,1,1,3,1,8,3,2,1,3,1,1,9,1,2,9,1,1,5,3,2,1,1,5,1,1,3,5,3,2,1,6,
%T A138731 1,7,2,4,1,3,1,23,2,8,2,1,19,1,23,1,3,1,18,1,2,1,1,3,24,1,4,1,1,5,1,1,
%U A138731 2,1,1,89,1,1,1,2,1,8,1,52,1,1,1,1,1,4,1,15,1,1,1,5,3,1,2,1,4,1,4,24,5,1,5
%N A138731 Continued fraction for 6th Du Bois Reymond constant.
%t A138731 ContinuedFraction[FullSimplify[TrigToExp[ -3 - 2Residue[x^2/((Tan[x] - x) (1 + x^2)^3), {x, I}]]], 100](*Artur Jasinski*)
%o A138731 (PARI) contfrac((exp(6)-6*exp(4)+3*exp(2)-98)/32) \\ _Charles R Greathouse IV_, Feb 24 2012
%Y A138731 Cf. A062545, A062546, A085466, A085467, A138729, A138730, A138731, A138732, A138733.
%K A138731 nonn,cofr
%O A138731 1,2
%A A138731 _Artur Jasinski_, Mar 26 2008