OFFSET
1,1
LINKS
FORMULA
a(n)=10*a(n-1)+13 (with a(1)=3).
G.f. x*(3+10*x) / ( (10*x-1)*(x-1) ). - R. J. Mathar, Aug 23 2011
EXAMPLE
For n=2, a(2)=10*3+13=43; n=3, a(3)=10*43+13=443; n=4, a(4)=10*443+13=4443
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Feb 24 2010
STATUS
approved