id:A108523 - OEIS Search Results

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Number of rooted identity trees with n generators.

+0
1

1, 1, 2, 4, 10, 27, 77, 226, 685, 2112, 6618, 20996, 67337, 217884, 710571, 2332958, 7705429, 25584035, 85346018, 285908169, 961440343, 3244259406, 10981797187, 37280278698, 126890974820, 432950169885, 1480542159038, 5073504809660 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`A generator is a leaf or a node with just one child.`
	LINKS	`N. J. A. Sloane, Transforms` `Index entries for sequences related to rooted trees`
	FORMULA	`G.f. satisfies (2-x)*A(x) = x - 1 + WEIGH(A(x))`
	CROSSREFS	`Cf. A108521-A108529, A004111.` `Sequence in context: A113066 A002459 A104383 this_sequence A114507 A127386 A099950` `Adjacent sequences: A108520 A108521 A108522 this_sequence A108524 A108525 A108526`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Jun 07 2005`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

AT&T Labs Research