OFFSET
0,2
COMMENTS
In base 11 these are 0, A, AA, AAA, ... - David Rabahy, Dec 12 2016
LINKS
FORMULA
G.f.: 1/(1-11*x)-1/(1-x). - Mohammad K. Azarian, Jan 14 2009
E.g.f.: e^(11*x)-e^x. - Mohammad K. Azarian, Jan 14 2009
a(n) = 11*a(n-1)+10 for n>0, a(0)=0. - Vincenzo Librandi, Nov 19 2010
a(n) = Sum_{i=1..n} 10^i*binomial(n,n-i) for n>0, a(0)=0. - Bruno Berselli, Nov 11 2015
a(n) = A001020(n) - 1. - Sean A. Irvine, Jun 19 2019
MATHEMATICA
LinearRecurrence[{12, -11}, {0, 10}, 18] (* Ray Chandler, Aug 26 2015 *)
PROG
(PARI) a(n)=11^n-1 \\ Charles R Greathouse IV, Dec 12 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved