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 A048850 #7 Oct 12 2013 15:16:36 %S A048850 0,2,1,6,8,7,3,4,5,13,12,14,18,16,10,11,9,20,21,22,15,17,28,29,34,19, %T A048850 35,36,37,38,23,24,41,39,47,26,27,45,25,51,50,52,53,30,55,31,59,58,32, %U A048850 33,62,67,65,69,70,72,73,43,71,76,40,42,77,46,48,83,44,49,84,90,86,88 %N A048850 Position of n in sequence A047708. %C A048850 Inverse permutation to A047708, i.e. A047708(A048850(n)) = n. %H A048850 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %K A048850 nonn %O A048850 0,2 %A A048850 _Howard A. Landman_