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 A102453 #6 Mar 30 2012 18:50:48 %S A102453 1,2,3,4,5,6,7,11,9,8,10,15,14,16,19,17,12,22,13,23,21,18,20,29,25,26, %T A102453 24,32,27,36,30,39,33,34,35,40,28,38,43,41,31,46,37,45,42,47,44,54,49, %U A102453 50,51,57,52,56,55,53,59,58,48,65,63,62,64,68,69,61,60,72,70,76,67,78 %N A102453 A101212(A101212(n)). %C A102453 Permutation of the positive integers with inverse A102455. %H A102453 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %K A102453 nonn %O A102453 1,2 %A A102453 _Reinhard Zumkeller_, Jan 09 2005