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 A113658 #5 Nov 03 2012 17:56:53 %S A113658 1,3,2,7,4,8,6,15,9,19,10,23,12,20,5,31,16,27,18,24,14,11,22,32,25,39, %T A113658 26,48,28,35,30,63,21,51,34,71,36,56,38,64,40,83,42,55,44,68,46,95,49, %U A113658 75,17,103,52,80,54,111,57,87,58,104,60,92,62,127,65,99,66,119,45,84,70 %N A113658 Where n appears in A111273. %C A113658 Inverse of the permutation of the natural numbers given in A111273. %H A113658 Donovan Johnson, <a href="/A113658/b113658.txt">Table of n, a(n) for n = 1..10000</a> %e A113658 A111273(15) = 8, hence a(8) = 15. %Y A113658 Cf. A111273, A113659. %K A113658 nonn %O A113658 1,2 %A A113658 _Klaus Brockhaus_, Nov 03 2005