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 A063189 #10 Jan 02 2022 21:04:42
%S A063189 1,7,9,13,132,259,756,995,1217,1790,3809,6320,17298,63963,266138,
%T A063189 821069,3300319,4218118,4403814,7172972,20058471,92458049,191069103,
%U A063189 765926110,822857354,2489215358,2980617344,5257976545,5926840761,11328877119,45478158116,66167647170
%N A063189 Engel expansion of Sum_{k>=0} 1/(6 + k)^k.
%C A063189 Shgz(6) = 1.1599604457220200725212487379412204309...
%t A063189 ToEngel[ x_, n_Integer ] := Rest@First@Transpose@NestList[ {Ceiling[ 1/# ], #}&[ Times@@#-1 ]&, {1, Abs[ x ]+1}, n ]
%Y A063189 Cf. A006784 for definition of Engel expansion.
%K A063189 nonn,easy
%O A063189 1,2
%A A063189 _Olivier Gérard_, Jul 10 2001