OFFSET
1,2
COMMENTS
See A191998.
FORMULA
EXAMPLE
The rationals r(n) are: 1, 3/2, 9/8, 21/16, 231/160, 847/640, 2541/2048, ...
CROSSREFS
KEYWORD
nonn,easy,frac
AUTHOR
Wolfdieter Lang, Jun 21 2011
STATUS
approved