id:A116956 - OEIS Search Results

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Number of functions f:{1,2,...,n}->{1,2,...,n} with odd cycles only.

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1, 1, 3, 18, 157, 1800, 25551, 432376, 8494809, 190029888, 4768313275, 132626098176, 4049755214517, 134677876657792, 4845193429684167, 187490897290080000, 7765153170076158001, 342721890859339812864 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`E.g.f.: sqrt((1-LambertW(-x))/(1+LambertW(-x))).` `Sum_{k=0..n} binomial(n,k)a(k)a(n-k) = 2*n^n, n>0. - Vladeta Jovovic (vladeta(AT)eunet.rs), Oct 11 2007`
	CROSSREFS	`Cf. A070896, A060281, A060435, A070896.` `Sequence in context: A107888 A138274 A060913 this_sequence A166887 A075678 A089901` `Adjacent sequences: A116953 A116954 A116955 this_sequence A116957 A116958 A116959`
	KEYWORD	`easy,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 30 2006`

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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.

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