OFFSET
1,1
EXAMPLE
A191329=(1,2,1,0,1,2,1,0,1,0,1,2,...), so that
a(1)=2, a(2)=6, a(3)=12,...
MATHEMATICA
(See A191329.)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, May 31 2011
STATUS
approved