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A018794 Number of subsets of { 1, ..., n } containing an A.P. of length 9. 0
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 12 17:44 EDT 2024. Contains 372492 sequences. (Running on oeis4.)