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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
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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
