id:A051303 - OEIS Search Results

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Number of 3-element proper antichains of an n-element set.

+0
4

0, 0, 0, 1, 30, 605, 9030, 110901, 1200150, 11932285, 111885510, 1006471301, 8786447670, 75039565965, 630534185190, 5234341175701 (list; graph; listen)

	OFFSET	`0,5`
	FORMULA	`1/3! (8^n -96^n +155^n -44^n -93^n +8*2^n -2)`
	CROSSREFS	`Cf. A032263, A036239, A051112.` `Sequence in context: A024436 A042744 A020980 this_sequence A020975 A124099 A028258` `Adjacent sequences: A051300 A051301 A051302 this_sequence A051304 A051305 A051306`
	KEYWORD	`nonn`
	AUTHOR	`Vladeta Jovovic, Goran Kilibarda, Zoran Maksimovic (vladeta(AT)Eunet.yu)`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research