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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
OFFSET
0,9
CROSSREFS
Sequence in context: A018795 A018794 A018793 * A360263 A018791 A306988
KEYWORD
nonn
STATUS
approved