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A018791 Number of subsets of { 1, ..., n } containing an A.P. of length 6. 0
0, 0, 0, 0, 0, 0, 1, 3, 8, 20, 48, 136, 344, 788, 1775, 3947, 9373, 21533, 48327, 104676, 224997, 496490, 1082575, 2334984, 4997364, 10532236, 22568064, 48062489, 101796210, 214545469, 450146443, 946329292, 1980769346 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,8

LINKS

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

CROSSREFS

Sequence in context: A018794 A018793 A018792 * A306988 A026723 A038746

Adjacent sequences:  A018788 A018789 A018790 * A018792 A018793 A018794

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified September 19 12:57 EDT 2019. Contains 327198 sequences. (Running on oeis4.)