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%I #8 Jun 18 2014 19:30:19
%S 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,1,11,11,12,21,13,31,14,41,15,
%T 51,16,61,17,71,18,81,19,91,20,2,21,12,22,22,23,32,24,42,25,52,26,62,
%U 27,72,28,82,29,92,30,3,31,13,32,23,33,33,34,43,35,53,36,63,37,73,38,83,39,93
%N Each natural number is followed by its reversal.
%H Alois P. Heinz, <a href="/A135020/b135020.txt">Table of n, a(n) for n = 1..10000</a>
%F a(n) = (n+1)/2 for n = odd, a(n) = A004086(n/2) for n = even.
%Y Cf. A004086.
%K easy,nonn,base,look
%O 1,3
%A _Rolf Pleisch_, Feb 10 2008
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