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A008857 floor(n/9)*ceil(n/9). 0
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 4, 6, 6, 6, 6, 6, 6, 6, 6, 9, 12, 12, 12, 12, 12, 12, 12, 12, 16, 20, 20, 20, 20, 20, 20, 20, 20, 25, 30, 30, 30, 30, 30, 30, 30, 30, 36, 42, 42, 42, 42, 42, 42, 42, 42, 49 (list; graph; refs; listen; history; internal format)
OFFSET

0,11

CROSSREFS

Sequence in context: A045818 A064128 A104274 * A047935 A103795 A123627

Adjacent sequences:  A008854 A008855 A008856 * A008858 A008859 A008860

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 15 05:45 EST 2012. Contains 205694 sequences.