%I #18 Jul 19 2021 04:13:47
%S 1,2,4,80,81,100,800,1000,1001,1002,2000,8001,10001,10002,10003,30001,
%T 100001,100002,100003,300001,1000000,1000001,2000001,10000001,
%U 10000002,40000000,200000001,1000000001,1000000002,2000000000,8000000001,10000000001,10000000002
%N Lexicographically earliest increasing sequence whose k-th digit is the absolute difference between the two digits touching the k-th comma.
%e The first comma is touched by digits 1 and 2 which subtracted absolutely give 1, the first digit of the sequence.
%e The 2nd comma is touched by digits 2 and 4 which subtracted absolutely give 2, the 2nd digit of the sequence.
%e The 3rd comma is touched by digits 4 and 8 which subtracted absolutely give 4, the 3rd digit of the sequence.
%Y Cf. A334336.
%K base,easy,nonn
%O 1,2
%A _Eric Angelini_ and _Alexandre Wajnberg_, Feb 03 2005
%E a(15) corrected and a(16) onwards from _Mohammed Yaseen_, Jul 10 2021