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 A120234 #2 Mar 30 2012 18:57:06 %S A120234 1,2,4,3,7,5,10,6,12,8,15,9,18,11,20,22,13,14,26,27,16,17,31,32,19,35, %T A120234 36,21,39,23,42,24,25,46,47,48,28,29,52,30,55,56,58,33,34,62,63,64,37, %U A120234 38,68,70,40,41,74,75,43,44,79,45,82,83,84,86,49,50,90,51,92,53,95,54 %N A120234 Inverse of A120233. %C A120234 A permutation of the natural numbers. %Y A120234 Cf. A120229, A120233. %K A120234 nonn %O A120234 1,2 %A A120234 _Clark Kimberling_, Jun 11 2006