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 A096193 #6 Feb 24 2021 08:38:35 %S A096193 1,2,3,3,3,3,10,19,27,32,41,209,351,809,1235,3337,4109,43834 %N A096193 Engel expansion of the Madelung constant A085469. %H A096193 Simon Plouffe, <a href="http://wayback.cecm.sfu.ca/projects/ISC/ISCmain.html">Plouffe's Inverter </a> lookup on 1.747564594633182 %e A096193 1 +1/2 +1/(2*3) +1/(2*3*3) + 1/(2*3*3*3) + 1/(2*3*3*3*3) + 1/(2*3*3*3*3*10)+.... = 1.74756... %K A096193 nonn %O A096193 1,2 %A A096193 _Gerald McGarvey_, Jul 25 2004