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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
OFFSET
0,8
CROSSREFS
Sequence in context: A018793 A018792 A360263 * A306988 A026723 A038746
KEYWORD
nonn
STATUS
approved