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 A138729 #4 Mar 31 2012 10:22:07
%S A138729 7,25,98,1167,4650,30930,1111860,31100895,13812610,894570642,
%T A138729 89419472100,1311049104750,47185076099700,350440263072900,
%U A138729 4578242813103960,4119778157653533375,16476927824724617250,124478128839848033250,40326914169455544130500
%N A138729 a(n) = -A085466(n) times the free coefficient of the 2n-th Du Bois-Reymond polynomial in e^2.
%t A138729 a = {7}; Do[p = FullSimplify[TrigToExp[ -3 - 2Residue[x^2/((Tan[x] - x) (1 + x^2)^n), {x, I}]]]; AppendTo[a, -First[p[[2]]]], {n, 2, 9}]; a (*Artur Jasinski*)
%Y A138729 Cf. A062545, A062546, A085466, A085467, A138729, A138730, A138731, A138732, A138733.
%K A138729 nonn
%O A138729 1,1
%A A138729 _Artur Jasinski_, Mar 26 2008
%E A138729 Edited and extended by _Max Alekseyev_, Sep 15 2009