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 A139134 #10 Sep 27 2013 06:29:41
%S A139134 1,0,1,3,12,65,417,3094,26243,250371,2652754,30910935,392895789,
%T A139134 5409783392,80214503397,1274329677391,21594115259540,388790596531173,
%U A139134 7411710847692157,149142571391245758,3159081458947418511
%N A139134 a(n) = n-th derivative of Sec(Exp(z)-1) at z=0.
%H A139134 Vincenzo Librandi, <a href="/A139134/b139134.txt">Table of n, a(n) for n = 0..100</a>
%F A139134 E.G.F. = sec(exp(z)-1)
%F A139134 a(n) ~ 2*n!/((2+Pi)*log((2+Pi)/2)^(n+1)). - _Vaclav Kotesovec_, Sep 25 2013
%t A139134 Table[D[Sec[Exp[x] - 1], {x, n}] /. x -> 0, {n, 0, 30}]
%Y A139134 Cf. A080832.
%K A139134 easy,nonn
%O A139134 0,4
%A A139134 Richard Chapling (r.chappers(AT)gmail.com), Jun 05 2008
%E A139134 Typo in Mathematica program corrected by _Vincenzo Librandi_, Sep 26 2013