%I
%S 1,2,3,5,7,10,13,18,23,16,9,19,29,42,55,73,91,68,45,61,77,86,95,114,
%T 133,104,75,117,159,214,269,342,415,324,233,165,97,142,187,248,309,
%U 232,155,241,327,422,517,631,745,612,479,375,271,196,121,238,355,514,673,887,1101,832,563,905,1247,1662,2077
%N Replace every term a(n) by the pair [a(n), a(n)] to form a new sequence S: S is the succession of the absolute differences of the starting sequence.
%C This is the lexicographically earliest sequence of distinct positive terms with this property.
%H Carole Dubois, <a href="/A338380/b338380.txt">Table of n, a(n) for n = 1..5001</a>
%e The successive absolute differences between two successive terms are 1, 1, 2, 2, 3, 3, 5, 5, 7, 7, 10, 10, 13, 13, 18, 18, 23, 23, 16, 16, 9, 9,... which is the sequence itself with every term duplicated.
%Y Cf. A033485 (same sequence, but strictly monotonically increasing).
%K base,nonn
%O 1,2
%A _Eric Angelini_ and _Carole Dubois_, Nov 05 2020
