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 A063194 #11 Jan 02 2022 20:24:19
%S A063194 1,1,4,7,7,11,80,114,6099,11431,26617,33585,56088,61344,194790,234794,
%T A063194 1389968,1786243,2418760,2647328,3746318,4952495,5249786,5341636,
%U A063194 10517386,55449405,79637649,561022295,625320951,3650616781
%N A063194 Engel expansion of 1 + Sum_{k>=1} 1/k^k.
%C A063194 Shgz(0) = 2.2912859970626635404072825905956005414... = 1 + A073009.
%t A063194 ToEngel[ x_, n_Integer ] := Rest@First@Transpose@NestList[ {Ceiling[ 1/# ], #}&[ Times@@#-1 ]&, {1, Abs[ x ]+1}, n ]
%Y A063194 Cf. A006784 for definition of Engel expansion, A073009.
%K A063194 nonn,easy
%O A063194 1,3
%A A063194 _Olivier Gérard_, Jul 10 2001