OFFSET
1,4
EXAMPLE
{4r+1r} = 0.09...; {4r-1r} = 0.85...;
{4r+2r} = 0.70...; {4r-2r} = 0.23...;
{4r+3r} = 0.32...; {4r-3r} = 0.61...;
{4r+4r} = 0.94...; {4r-4r} = 0.00...;
so that a(4)=2.
MATHEMATICA
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Sep 03 2011
STATUS
approved