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A018794 Number of subsets of { 1, ..., n } containing an A.P. of length 9. 0
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 8, 20, 48, 112, 256, 576, 1488, 3648, 8208, 18239, 40123, 87532, 189630, 408376, 932127, 2091911, 4632601, 9939498, 21220735, 45121371, 95597951, 201891450 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,11

LINKS

Table of n, a(n) for n=0..32.

CROSSREFS

Sequence in context: A168150 A001792 A018795 * A018793 A018792 A018791

Adjacent sequences:  A018791 A018792 A018793 * A018795 A018796 A018797

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified February 11 09:57 EST 2016. Contains 268164 sequences.