OFFSET
1,2
EXAMPLE
a(4)=1+(1+1)+(2+1)+(1+2+1+1)=11
CROSSREFS
KEYWORD
easy,nonn,base
AUTHOR
Philippe LALLOUET (philip.lallouet(AT)wanadoo.fr), Apr 11 2007
EXTENSIONS
Edited and extended by R. J. Mathar, Jan 23 2008
STATUS
approved