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 A112979 #6 Mar 30 2012 18:50:53 %S A112979 1,2,3,12,9,5,43,4,17,6,22,7,26,8,27,33,112,10,40,11,13,14,154,49,15, %T A112979 16,18,59,62,19,67,20,21,23,74,24,81,80,25,28,90,29,95,30,94,31,104, %U A112979 32,34,106,35,36,119,37,38,122,39,41,133,42,137,44,138,45,46,47,150,48,50,51 %N A112979 A112978(A112978(n)). %C A112979 Inverse integer permutation of A112977; %C A112979 A112975(a(n)) = a(A112975(n)) = A112978(n). %H A112979 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %K A112979 nonn %O A112979 1,2 %A A112979 _Reinhard Zumkeller_, Oct 08 2005