A018794 - OEIS

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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, 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; internal format)

	OFFSET	`0,11`
	CROSSREFS	`Sequence in context: A049610 A168150 A018795 * A018793 A018792 A018791` `Adjacent sequences: A018791 A018792 A018793 * A018795 A018796 A018797`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified February 15 18:22 EST 2012. Contains 205835 sequences.