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 A318534 #10 Sep 04 2018 15:18:46 %S A318534 1,2,3,4,5,6,16,7,15,18,9,13,20,12,10,23,21,34,26,29,37,40,32,24,31, %T A318534 35,27,17,38,28,49,39,60,41,8,14,19,25,30,36,52,47,54,43,45,56,55,11, %U A318534 22,44,33,66,65,46,42,57,64,67,74,77,84,87,94,97,105,76,75,86,85,96,95,107,115,117,125,127,135,137,145,147,48 %N A318534 Lexicographically first sequence of distinct positive integers such that [a(n) + a(n+1)] or [a(n) - a(n+1)] is a palindrome in base 10. %C A318534 Is this sequence a permutation of the positive integers? %H A318534 Jean-Marc Falcoz, <a href="/A318534/b318534.txt">Table of n, a(n) for n = 1..10001</a> %e A318534 The sequence starts with 1,2,3,4,5,6,16,7,15,18,9,... and we see that [1 + 2] is a palindrome (3); [2 + 3] is a palindrome (5); [3 + 4] is a palindrome (7); [4 + 5] is a palindrome (9); [5 + 6] is a palindrome (11); [6 + 16] is a palindrome (22); [16 - 7] is a palindrome (9); [7 + 15] is a palindrome (22); etc. %Y A318534 Cf A228730 (Lexicographically earliest sequence of distinct nonnegative integers such that the sum of two consecutive terms is a palindrome in base 10). %K A318534 base,look,nonn %O A318534 1,2 %A A318534 _Jean-Marc Falcoz_ and _Eric Angelini_, Aug 28 2018