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 A102454 #6 Mar 30 2012 18:50:48 %S A102454 1,2,3,5,4,7,6,11,9,8,10,13,17,12,14,15,19,23,16,18,21,20,22,29,25,26, %T A102454 24,31,27,28,37,30,33,34,35,32,41,38,36,39,43,47,40,42,46,44,45,53,49, %U A102454 51,50,48,59,52,55,57,54,58,56,61,67,62,60,65,63,71,66,69,64,68,73,70 %N A102454 Inverse of A101212. %H A102454 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %K A102454 nonn %O A102454 1,2 %A A102454 _Reinhard Zumkeller_, Jan 09 2005