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The sequence starts with a(1)=0 and a(n) is the smallest integer not yet present that has a palindromic link with one or more previous terms; said link is a palindromic pattern involving one or more digits of a(n) and one or more digits of a(n-1), a(n-2), ... .
1

%I #17 Dec 02 2019 03:20:48

%S 0,10,1,11,12,2,13,3,14,4,15,5,16,6,17,7,18,8,19,9,29,20,21,22,23,24,

%T 25,26,27,28,38,30,31,32,33,34,35,36,37,39,49,40,41,42,43,44,45,46,47,

%U 48,58,50,51,52,53,54,55,56,57,59,69,60,61,62,63,64,65,66,67,68,78,70,71,72,73,74,75,76,77,79,89,80,81,82,83,84,85,86,87,88,98,90,91,92,93,94,95,96,97,99,119,100,101,102,112,103,113,104,114,105,115,106,116,107,117,108,118,109,190,110,111,120,200,201,121

%N The sequence starts with a(1)=0 and a(n) is the smallest integer not yet present that has a palindromic link with one or more previous terms; said link is a palindromic pattern involving one or more digits of a(n) and one or more digits of a(n-1), a(n-2), ... .

%C Terms computed by _Jean-Marc Falcoz_.

%H Jean-Marc Falcoz, <a href="/A239113/b239113.txt">Table of n, a(n) for n = 1..2341</a>

%H Eric Angelini, <a href="http://www.cetteadressecomportecinquantesignes.com/PalChain.htm">Palindromes' chain</a>

%H Eric Angelini, <a href="/A239113/a239113.pdf">Palindromes' chain</a> [Cached copy, included with permission of the author]

%e (0,10) is the first palindromic link; (10,1) is the second; (1,1) is the third; (1,1) is the fourth one; (2,2) is the fifth one; (1,2,12) is the sixth one; (3,3) the next one, etc.

%K nonn,base,look

%O 1,2

%A _Eric Angelini_, Mar 10 2014