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 A193854 #14 Mar 30 2012 18:51:10 %S A193854 0,1,4,24,191,3096,3728,6320,314102,9645152,187895163 %N A193854 Numbers m such that A062039(m) = 1. %C A193854 A062039(a(n)) = 1. %o A193854 (Haskell) %o A193854 import Data.List (elemIndices) %o A193854 a193854 n = a193854_list !! (n-1) %o A193854 a193854_list = elemIndices 1 a062039_list %K A193854 nonn,more %O A193854 1,3 %A A193854 _Reinhard Zumkeller_, Aug 10 2011 %E A193854 a(10)-a(11) from _Donovan Johnson_, Aug 11 2011