id:A121921 - OEIS Search Results

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A102897(n) - 1.

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1, 3, 13, 121, 4959, 2771103, 151947502947 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Same as A102897, but counts nonempty set systems.`
	CROSSREFS	`Sequence in context: A119723 A093011 A057865 this_sequence A161677 A054933 A130589` `Adjacent sequences: A121918 A121919 A121920 this_sequence A121922 A121923 A121924`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Mar 17 2007`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.