A018792 Number of subsets of { 1, ..., n } containing an A.P. of length 7.

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

Links

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

Crossrefs

Sequence in context: A018795 A018794 A018793 * A360263 A018791 A306988

Adjacent sequences: A018789 A018790 A018791 * A018793 A018794 A018795

Keyword

nonn

Author

David W. Wilson

Status

approved