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A189671
Partial sums of A189668.
4
0, 1, 1, 2, 2, 2, 2, 3, 3, 4, 4, 4, 4, 5, 5, 5, 6, 6, 6, 7, 7, 8, 8, 8, 8, 9, 9, 10, 10, 10, 10, 11, 11, 11, 12, 12, 12, 13, 13, 14, 14, 14, 14, 15, 15, 15, 16, 16, 17, 17, 17, 17, 18, 18, 18, 19, 19, 20, 20, 20, 20, 21, 21, 22, 22, 22, 22, 23, 23, 23, 24, 24, 24, 25, 25, 26, 26, 26, 26, 27, 27, 28
OFFSET
1,4
COMMENTS
See A189668.
FORMULA
s(n)=s([(n+2)/3])+[(n+1)/3]-s([(n+1)/3]), where s(0)=0, s(1)=0.
MATHEMATICA
(See A189668.)
Accumulate[Nest[Flatten[#/.{0->{0, 1, 0}, 1->{1, 0, 0}}]&, {0}, 5]] (* Harvey P. Dale, Apr 24 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Apr 25 2011
STATUS
approved