login
A189667
Partial sums of A189664.
4
0, 1, 1, 1, 1, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 7, 7, 7, 8, 8, 9, 9, 9, 10, 10, 10, 10, 11, 11, 12, 12, 12, 13, 13, 13, 13, 14, 14, 15, 15, 15, 16, 16, 16, 17, 17, 17, 17, 18, 18, 19, 19, 19, 19, 20, 20, 21, 21, 21, 22, 22, 22, 23, 23, 23, 23, 24, 24, 25, 25, 25, 25, 26, 26, 27, 27, 27
OFFSET
1,6
COMMENTS
See A189664.
FORMULA
s(n)=[(n+1)/3]-s([(n+1)/3])+s([n/3]), where s(0)=0.
MATHEMATICA
(See A189664.)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Apr 25 2011
STATUS
approved