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 A059187 #25 Apr 13 2018 11:20:44
%S A059187 1,2,2,12,13,90,121,3457,7372,42530,147081,348753,1185480,17262610,
%T A059187 28408922,87175278,120293961,344697955,634418862,3889219736,
%U A059187 8965899278,9695659687,18962955420,27004920068,67070581522
%N A059187 Engel expansion of sqrt(Pi) = 1.77245... .
%C A059187 Cf. A006784 for definition of Engel expansion.
%D A059187 F. Engel, Entwicklung der Zahlen nach Stammbruechen, Verhandlungen der 52. Versammlung deutscher Philologen und Schulmaenner in Marburg, 1913, pp. 190-191.
%H A059187 G. C. Greubel, <a href="/A059187/b059187.txt">Table of n, a(n) for n = 1..1000</a>
%H A059187 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 A059187 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 A059187 <a href="/index/El#Engel">Index entries for sequences related to Engel expansions</a>
%t A059187 EngelExp[A_, n_] := Join[Array[1 &, Floor[A]], First@Transpose@
%t A059187 NestList[{Ceiling[1/Expand[#[[1]] #[[2]] - 1]], Expand[#[[1]] #[[2]] - 1]/1} &, {Ceiling[1/(A - Floor[A])], (A - Floor[A])/1}, n - 1]];
%t A059187 EngelExp[N[Sqrt[Pi], 7!], 100] (* Modified by _G. C. Greubel_, Dec 27 2016 *)
%Y A059187 Cf. A002161 (sqrt(Pi)).
%K A059187 nonn,easy,nice
%O A059187 1,2
%A A059187 _Mitch Harris_