OFFSET
1,1
EXAMPLE
a(1)=2+0=2, a(2)=4+1=5, a(3)=6+3=9, a(4)=12+5=17.
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Nov 14 2009
EXTENSIONS
All terms > 110 corrected by R. J. Mathar, May 30 2010
STATUS
approved