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%I #21 Dec 23 2015 17:57:19
%S 1,1,2,1,2,3,1,2,4,1,2,3,5,1,2,3,6,1,2,3,4,7,1,2,4,8,1,2,3,6,9,1,2,3,
%T 5,10,1,2,3,4,7,11,1,2,3,6,12,1,2,3,5,8,13,1,2,3,4,7,14,1,2,3,5,10,15,
%U 1,2,4,8,16,1,2,4,8,9,17,1,2,3,6,9,18,1,2,3,4,8,11,19,1,2,3,5,10,20
%N Irregular triangle read by rows: row n gives lexicographically first addition chain of minimal length for n.
%C The addition chains in this sequence for 1, 2, 3, 7 start respectively with 1, 1,2, 1,2,3, and 1,2,3,4. Are there minimal addition chains starting 1,2,3,4,5? 1,2,...,n for larger n?
%C Needs a b-file.
%e The table starts:
%e 1
%e 1 2
%e 1 2 3
%e 1 2 4
%e 1 2 3 5
%e 1 2 3 6
%e 1 2 3 4 7
%e 1 2 4 8
%e ...
%Y Cf. A265690 (row lengths), A265692 (largest).
%K nonn,tabf,nice
%O 1,3
%A _Franklin T. Adams-Watters_, Dec 13 2015
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