A121921 - OEIS

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A121921

A102897(n) - 1.

1, 3, 13, 121, 4959, 2771103, 151947502947 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`Same as A102897, but counts nonempty set systems.`
	CROSSREFS	`Sequence in context: A119723 A093011 A057865 * A191955 A182864 A161677` `Adjacent sequences: A121918 A121919 A121920 * A121922 A121923 A121924`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Mar 17 2007`

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Last modified February 15 07:22 EST 2012. Contains 205706 sequences.