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 A262603 #6 Sep 25 2015 14:54:09 %S A262603 2,1,6,3,12,4,18,5,7,8,22,10,42,9,30,15,60,14,54,16,13,11,46,20,66,21, %T A262603 19,26,58,24,62,17,25,32,90,28,126,27,35,34,150,36,98,33,39,23,94,40, %U A262603 43,44,120,45,106,38,41,52,37,29,118,48,198,31,57,51,210,50 %N A262603 Inverse permutation to A262599. %H A262603 Paul Tek, <a href="/A262603/b262603.txt">Table of n, a(n) for n = 1..2500</a> %H A262603 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A262603 Cf. A262599. %K A262603 nonn %O A262603 1,1 %A A262603 _Paul Tek_, Sep 25 2015