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 A063192 #9 Jan 02 2022 20:29:18
%S A063192 1,10,12,16,21,22,33,64,64,372,7928,10206,18400,319831,429477,588460,
%T A063192 849875,859279,2903676,11021989,14742559,16613535,48017191,329292950,
%U A063192 3988366898,5315516684,19567917130,21634744969,23775894403
%N A063192 Engel expansion of Sum_{k>=0} 1/(9 + k)^k.
%C A063192 Shgz(9) = 1.1088801303029550442121544797829556538...
%t A063192 ToEngel[ x_, n_Integer ] := Rest@First@Transpose@NestList[ {Ceiling[ 1/# ], #}&[ Times@@#-1 ]&, {1, Abs[ x ]+1}, n ]
%Y A063192 Cf. A006784 for definition of Engel expansion.
%K A063192 nonn,easy
%O A063192 1,2
%A A063192 _Olivier Gérard_, Jul 10 2001