Love sequence number one

[Eric Angelini]

Hello SeqFan,

what about this fantasy "love sequence":

12,14,15,18,24,26,36,64,76,91,92,162,601,791,801,861,862,991,1091,1109...

a) a(n) says « Consider the sequence as a succession of *digits* ; then,
   in position a(n), there is a "6" digit »
b) read all a(n)s backwards: those are the positions of all "9" digits
   in the sequence...

Example:

The 12th digit of the seq is a "6"; so does the 14th, the 15th, the 18th, etc.
The 21st digit of the seq is a "9"; so does the 41th, the 51th, the 81th (not
    visible here), etc.

Best,
É.