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 A180079 #4 Mar 30 2012 18:51:06 %S A180079 0,1,5,7,3,4,19,2,13,23,11,12,49,43,58,79,9,29,21,15,10,99,16,28,39,6, %T A180079 64,120,27,104,164,110,62,127,25,143,45,8,135,107,33,141,46,14,162,85, %U A180079 41,30,66,48,60,83,37,91,152,17,355,80,170,331,286,47,336,190,56,114,97 %N A180079 A180077(A180077(n)). %C A180079 Permutation of the natural numbers with inverse A180078; %C A180079 a(A180076(n)) = A180076(a(n)) = A180077(n). %H A180079 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %K A180079 nonn %O A180079 0,3 %A A180079 _Reinhard Zumkeller_, Aug 14 2010