OFFSET
1,2
EXAMPLE
a(1)=1+0=1, a(2)=2+4=6, a(3)=3+5=8.
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Dec 09 2009
EXTENSIONS
Entries checked by R. J. Mathar, May 23 2010
STATUS
approved