OFFSET
1,2
EXAMPLE
a(1)=1-0=1, a(2)=5-1=4, a(3)=7-3=4, a(4)=11-5=6, a(5)=13-7=6, a(6)=17-8=9.
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Dec 07 2009
EXTENSIONS
Edited by Omar E. Pol, Apr 14 2010
STATUS
approved