OFFSET
0,1
FORMULA
a(n) =1/2{10^(n-1) + 10^n -2}
EXAMPLE
a(2) = Arithmetic mean of 10,12,14,...96,98 =(10 + 98)/2 =54.
MATHEMATICA
Table[FromDigits[PadRight[{5, 4}, n, 9]], {n, 20}] (* Harvey P. Dale, Apr 24 2020 *)
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy, Aug 02 2005
EXTENSIONS
Corrected and extended by Joshua Zucker, May 10 2006
STATUS
approved