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 A098584 #4 Jul 28 2015 21:47:52
%S A098584 1,5,2,3,2,3,0,3,2,4,2,0,8,5,2,9,8,3,0,7,0,4,3,0,8,1,7,2,5,1,7,7,0,6,
%T A098584 5,5,7,6,2,2,8,6,3,5,2,9,1,7,7,5,8,3,8,0,4,4,2,3,2,1,1,4,6,2,8,3,4,3,
%U A098584 3,3,5,7,1,8,9,7,6,6,2,8,0,4,9,7,1,9,6,5,9,2,4,5,4,3,3,6,4,1,9,3,6,6,1,9,7
%N A098584 Limit of the power tower t(2)^(t(3)^(t(4)^(t(5)^(...) ...))) in which t(n)=n^(1/n!).
%e A098584 1.523230324208529830704308172517706557622863529177583804423211462834333571897662804971965924543364193...
%p A098584 m:=1: for n from 300 to 2 by -1 do: m:=(n^(1/n!))^m: od: evalf(m,100);
%t A098584 f[n_] := Block[{k = n, e = 1}, While[k > 1, e = N[(k^(1/k!))^e, 128]; k-- ]; e]; RealDigits[ f[18], 10, 105][[1]] (* _Robert G. Wilson v_, Sep 18 2004 *)
%Y A098584 See A098454 for the limit if t(n)=n^(1/n).
%K A098584 cons,easy,nonn
%O A098584 1,2
%A A098584 Mark Hudson (mrmarkhudson(AT)hotmail.com), Sep 16 2004