id:A051304 - OEIS Search Results

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Number of 4-element proper antichains of an n-element set.

+0
2

0, 0, 0, 0, 5, 780, 41545, 1442910, 39400305, 923889960, 19550316665, 384954289170, 7196416532305, 129495073447740, 2264887575116985, 38775513868485030 (list; graph; listen)

	OFFSET	`0,5`
	FORMULA	`(1/4!) * (16^n -1812^n +6010^n -99^n -1028^n +1057^n -906^n +955^n -314^n -333^n +282^n -6)`
	CROSSREFS	`Cf. A032263, A036239, A051112.` `Sequence in context: A092133 A071772 A157281 this_sequence A060713 A085706 A135084` `Adjacent sequences: A051301 A051302 A051303 this_sequence A051305 A051306 A051307`
	KEYWORD	`nonn`
	AUTHOR	`Vladeta Jovovic, Goran Kilibarda, Zoran Maksimovic (vladeta(AT)eunet.rs)`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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