A189660 - OEIS

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A189660

Partial sums of A064990.

6

0, 0, 1, 1, 1, 2, 3, 4, 4, 4, 4, 5, 5, 5, 6, 7, 8, 8, 9, 10, 10, 11, 12, 12, 12, 12, 13, 13, 13, 14, 14, 14, 15, 16, 17, 17, 17, 17, 18, 18, 18, 19, 20, 21, 21, 22, 23, 23, 24, 25, 25, 25, 25, 26, 27, 28, 28, 29, 30, 30, 30, 30, 31, 32, 33, 33, 34, 35, 35, 35, 35, 36, 36, 36, 37, 37, 37, 38, 39, 40, 40

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,6

COMMENTS

LINKS

Table of n, a(n) for n=1..81.

FORMULA

s(n)=s([(n+2)/3])+s([(n+1)/3])+[n/3]-s([n/3]), where s(0)=0, s(1)=0.

MATHEMATICA

(See A064990.)

CROSSREFS

Cf. A064990, A189658, A189659.

Sequence in context: A087848 A087844 A287635 * A194167 A140427 A194816

Adjacent sequences: A189657 A189658 A189659 * A189661 A189662 A189663

KEYWORD

nonn

AUTHOR

Clark Kimberling, Apr 25 2011

STATUS

approved