OFFSET
1,2
COMMENTS
If a(n-1) ends in 9, a(n) must begin with 8 (i.e., a forced decrease by 1).
EXAMPLE
9 is followed by 81 in the sequence since there is no larger digit and 8 has already been used.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Enrique Navarrete, Jun 19 2017
STATUS
approved