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A189726
Partial sums of A189723.
4
0, 1, 2, 3, 3, 4, 5, 5, 6, 7, 7, 8, 8, 9, 10, 11, 11, 12, 13, 13, 14, 14, 15, 16, 17, 17, 18, 19, 19, 20, 20, 21, 22, 23, 23, 24, 24, 25, 26, 27, 27, 28, 29, 29, 30, 31, 31, 32, 32, 33, 34, 35, 35, 36, 37, 37, 38, 38, 39, 40, 41, 41, 42, 42, 43, 44, 45, 45, 46, 47, 47, 48, 49, 49, 50, 50, 51, 52, 53, 53, 54
OFFSET
1,3
COMMENTS
See A189723.
FORMULA
s(n)=s([(n+2)/3])+[(n+1)/3]-s([(n+1)/3])+[n/3], where s(0)=0, s(1)=0.
MATHEMATICA
(See A189723.)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Apr 26 2011
STATUS
approved