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A018792 Number of subsets of { 1, ..., n } containing an A.P. of length 7. 0
0, 0, 0, 0, 0, 0, 0, 1, 3, 8, 20, 48, 112, 300, 752, 1712, 3839, 8507, 18668, 43437, 98919, 221527, 478718, 1027994, 2196398, 4811804, 10446823, 22508560, 48207309, 101582640, 213430157, 456774962, 972054283 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,9

LINKS

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

CROSSREFS

Sequence in context: A018795 A018794 A018793 * A018791 A306988 A026723

Adjacent sequences:  A018789 A018790 A018791 * A018793 A018794 A018795

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified October 16 16:08 EDT 2019. Contains 328101 sequences. (Running on oeis4.)