OFFSET
1,2
COMMENTS
The terms > 9 are all numbers of the form x*10^d + y, 0 <= y <= x-2, 2 <= x <= 8, d>=1, or 10^d + y, 0 <= y <= 8, d >= 2. - Robert Israel, Mar 30 2017
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
FORMULA
a(n+74) = 11 a(n+37) - 10 a(n) for n >= 10. - Robert Israel, Mar 30 2017
MAPLE
L:= {$1..9, seq(seq(seq(10^k*x+y, y=0..x-2), x=0..8), k=1..30), seq(seq(10^k+y, y=0..8), k=2..30)}:
sort(convert(L, list)); # Robert Israel, Mar 30 2017
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Rodolfo Kurchan, Sep 18 2016
EXTENSIONS
Corrected by Robert Israel, Mar 30 2017
STATUS
approved