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 A059200 #29 Apr 13 2018 11:25:58
%S A059200 3,11,11,23,62,66,466,1450,7617,95677,100963,153329,966054,4744661,
%T A059200 23899231,25086529,52363821,100389201,201892089,261170111,312778184,
%U A059200 527002514,1235004065,1623652949,2309078745,8274570969
%N A059200 Engel expansion of -log(log(2)) = 0.36651292... .
%C A059200 Cf. A006784 for definition of Engel expansion.
%D A059200 F. Engel, Entwicklung der Zahlen nach Stammbruechen, Verhandlungen der 52. Versammlung deutscher Philologen und Schulmänner in Marburg, 1913, pp. 190-191.
%H A059200 G. C. Greubel, <a href="/A059200/b059200.txt">Table of n, a(n) for n = 1..1000</a>
%H A059200 F. Engel, <a href="/A006784/a006784.pdf">Entwicklung der Zahlen nach Stammbruechen</a>, Verhandlungen der 52. Versammlung deutscher Philologen und Schulmaenner in Marburg, 1913, pp. 190-191. English translation by Georg Fischer, included with his permission.
%H A059200 P. Erdős and Jeffrey Shallit, <a href="http://www.numdam.org/item?id=JTNB_1991__3_1_43_0">New bounds on the length of finite Pierce and Engel series</a>, Sem. Theor. Nombres Bordeaux (2) 3 (1991), no. 1, 43-53.
%H A059200 <a href="/index/El#Engel">Index entries for sequences related to Engel expansions</a>
%t A059200 EngelExp[A_, n_] := Join[Array[1 &, Floor[A]], First@Transpose@
%t A059200 NestList[{Ceiling[1/Expand[#[[1]] #[[2]] - 1]], Expand[#[[1]] #[[2]] - 1]/1} &, {Ceiling[1/(A - Floor[A])], (A - Floor[A])/1}, n - 1]];
%t A059200 EngelExp[N[-Log[Log[2]], 7!], 100] (* Modified by _G. C. Greubel_, Dec 28 2016 *)
%Y A059200 Cf. A074785.
%K A059200 nonn,easy,nice
%O A059200 1,1
%A A059200 _Mitch Harris_