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 A131396 #14 Nov 29 2017 03:34:15 %S A131396 1,2,4,5,8,10,11,13,16,17,19,21,24,25,27,30,31,34,35,37,39,41,43,46, %T A131396 48,49,51,53,56,57,59,61,63,65,67,69,71,73,75,77,78,80,82,84,87,89,91, %U A131396 93,95,97,99,101,103,105,107,108,111,112,114,117,119,121,123,125,127,129 %N A131396 Positions of n-th positive integer in A131394, minus 1. %C A131396 If A131394 is a permutation of the integers, as conjectured, then A131396 is the complement of A131397. %H A131396 <a href="/A131396/b131396.txt">Table of n, a(n) for n = 1..66</a> %F A131396 a(n) = position of n-th positive integers in A131393, minus 1. %e A131396 The 5th positive integer to occur in A131393 is 6, which occurs at position 9, so that a(5) = 9 - 1 = 8. %K A131396 nonn %O A131396 1,2 %A A131396 _Clark Kimberling_, Jul 06 2007, Jul 21 2007