OFFSET
1,1
EXAMPLE
n=2: r(2)-2=4-2=2=a(1).
n=3: r(3)-3=6-3=3=a(2).
n=7: r(7)-7=12-7=5=a(3).
n=11: r(11)-11=18-11=7=a(4).
n=21: r(21)-21=32-21=11=a(5).
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Sep 13 2008
EXTENSIONS
Corrected and extended by R. J. Mathar, Sep 26 2008
STATUS
approved