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 A063190 #8 Jan 02 2022 21:04:55
%S A063190 1,8,10,14,36,45,88,102,114,432,4369,9183,15670,31307,103514,511249,
%T A063190 1673274,2394998,3225410,4732293,54612351,55335052,220482735,
%U A063190 39208626697,290846809341,296349507792,2280942643369,2891972596111
%N A063190 Engel expansion of Sum_{k>=0} 1/(7 + k)^k.
%C A063190 Shgz(7) = 1.1384182162015123957749881105729298508...
%t A063190 ToEngel[ x_, n_Integer ] := Rest@First@Transpose@NestList[ {Ceiling[ 1/# ], #}&[ Times@@#-1 ]&, {1, Abs[ x ]+1}, n ]
%Y A063190 Cf. A006784 for definition of Engel expansion.
%K A063190 nonn,easy
%O A063190 1,2
%A A063190 _Olivier Gérard_, Jul 10 2001