A018794 Number of subsets of { 1, ..., n } containing an A.P. of length 9.

0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 8, 20, 48, 112, 256, 576, 1488, 3648, 8208, 18239, 40123, 87532, 189630, 408376, 932127, 2091911, 4632601, 9939498, 21220735, 45121371, 95597951, 201891450

Offset

0,11

Links

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

Crossrefs

Sequence in context: A001792 A049610 A018795 * A018793 A018792 A360263

Adjacent sequences: A018791 A018792 A018793 * A018795 A018796 A018797

Keyword

nonn

Author

David W. Wilson

Status

approved