OFFSET
1,4
COMMENTS
Related sequences:
In each case, trivially, the sum of the first two sequences is A000027(for n>0), and likewise for the sum of the other two.
EXAMPLE
{r}=0.7...; {2r}=0.4...; {3r}=0.1...;
{4f}=0.9...; {5r}=0.6...; so that a(5)=3.
MATHEMATICA
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Sep 02 2011
STATUS
approved