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%I #10 May 15 2019 22:52:40
%S 1,2,3,6,9,12,15,18,21,24,27,30,33,36,39,41,44,47,50,53,56,59,62,65,
%T 68,71,73,76,78,81,84,87,90,93,96,99,102,105,108,111,114,117,120,123,
%U 126,129,132,135,138,141,144,147,150,153,156,159,162,165,168
%N List of x-coordinates of successive points on the middle one of the three lines formed by the terms of A081145.
%C See A081145 and A308009 for further information about the three lines.
%H N. J. A. Sloane, <a href="/A308012/b308012.txt">Table of n, a(n) for n = 1..34254</a>
%Y Cf. A081145, A308009, A308010-A308015.
%K nonn
%O 1,2
%A _N. J. A. Sloane_, May 15 2019