From reader Éric Angelini:

What distinguishes this sequence of integers?

10, 9, 18, 10, 17, 10, 9, 10, 16, 10, 9, 18 …

Adding 9 to each successive digit and inserting a comma after the result reproduces the original sequence:

1 + 9 = 10
0 + 9 = 9
9 + 9 = 18
1 + 9 = 10
8 + 9 = 17, etc.

This example (A369603 in OEIS) is lexicographically the earliest such sequence beginning with 10.

(Thanks, Éric.)