id:A108530 - OEIS Search Results

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Number of rooted identity trees with n internal (non-leaf) nodes.

+0
3

1, 1, 2, 4, 12, 34, 110, 364, 1248, 4356, 15520, 56022, 204726, 755472, 2812004, 10543718, 39791070, 151022006, 576090250, 2207493080, 8493196536, 32797115398, 127071214442, 493831241234, 1924504466246, 7519182311366 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Also for n>0, rooted trees with n nodes and 2-colored internal nodes. Black nodes correspond to nodes with a leaf child; white nodes correspond to those without one.`
	LINKS	`Index entries for sequences related to rooted trees` `N. J. A. Sloane, Transforms`
	FORMULA	`Shifts left and halves under WEIGH transform.`
	CROSSREFS	`Cf. A004111, A004113, A108531, A108532.` `Sequence in context: A148197 A148198 A148199 this_sequence A001895 A148200 A148201` `Adjacent sequences: A108527 A108528 A108529 this_sequence A108531 A108532 A108533`
	KEYWORD	`nonn,eigen`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Jun 07 2005`

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Last modified December 4 08:07 EST 2009. Contains 170310 sequences.

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