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 A120242 #7 Apr 09 2014 10:15:02 %S A120242 1,2,4,3,8,5,16,6,9,7,32,10,17,11,64,12,18,13,33,14,19,15,128,20,34, %T A120242 21,65,22,35,23,256,24,36,25,66,26,37,27,129,28,38,29,67,30,39,31,512, %U A120242 40,68,41,130,42,69,43,257,44,70,45,131,46,71,47,1024,48,72,49,132,50,73 %N A120242 Inverse permutation to permutation sequence A120241. %C A120242 This sequence is a permutation of the positive integers. %Y A120242 Cf. A120241. %K A120242 easy,nonn %O A120242 1,2 %A A120242 _Leroy Quet_, Jun 11 2006 %E A120242 Extended by _Ray Chandler_, Jun 19 2006