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 A118758 #12 Jun 20 2018 01:36:04 %S A118758 0,1,2,3,4,5,6,7,8,9,19,18,17,16,15,14,13,12,11,10,20,21,22,23,24,25, %T A118758 26,27,28,29,39,38,37,36,35,34,33,32,31,30,40,41,42,43,44,45,46,47,48, %U A118758 49,59,58,57,56,55,54,53,52,51,50,60,61,62,63,64,65,66,67,68,69,79,78,77 %N A118758 Inverse of A118757. %C A118758 Permutation of the natural numbers with fixed points A118761: a(A118761(n)) = A118761(n); %C A118758 A118760(n) = a(a(n)); a(n) = A118757(n) for n < 100. %H A118758 R. Zumkeller, <a href="/A118758/b118758.txt">Table of n, a(n) for n = 0..30000</a> %H A118758 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A118758 Cf. A118764. %K A118758 nonn,look %O A118758 0,3 %A A118758 _Reinhard Zumkeller_, May 01 2006