OFFSET
1,1
EXAMPLE
A191329=(1,2,1,0,1,2,1,0,1,0,1,2,1,0,1...),
so that a(1)=4, a(2)=8, a(3)=10,...
MATHEMATICA
(See A191329.)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, May 31 2011
STATUS
approved