A048828 - OEIS

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A048828

Number of identity (asymmetric) trees of width n.

1, 0, 0, 0, 0, 1, 4, 66, 65328, 2146402440 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,7`
	LINKS	`Index entries for sequences related to trees`
	FORMULA	`a(2n)=2^(c(n-2))(2^b(n-1)-b(n-1)-1), a(2n+1)=b(n)(b(n)-1)/2, b: A038081. c: A014221.`
	CROSSREFS	`Sequence in context: A197947 A025585 A198893 * A003360 A083931 A133881` `Adjacent sequences: A048825 A048826 A048827 * A048829 A048830 A048831`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Jun 15 1999.`

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Last modified February 16 21:51 EST 2012. Contains 205978 sequences.