id:A052326 - OEIS Search Results

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Number of asymmetric trees with a forbidden limb of length 3.

+0
1

1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 6, 11, 25, 49, 105, 211, 444, 903, 1880, 3865, 8042, 16658, 34764, 72484, 151856, 318418, 669934, 1411637, 2982407, 6311760, 13387127, 28442458, 60543586, 129084965, 275683061, 589660911, 1263128375 (list; graph; listen)

	OFFSET	`0,13`
	COMMENT	`A tree with a forbidden limb of length k is a tree where the path from any leaf inward hits a branching node or another leaf within k steps.`
	LINKS	`Index entries for sequences related to Lyndon words`
	FORMULA	`G.f.: 1+B(x)+x^4+x^5+x^6-(B(x^2)+B(x)^2)/2 where B(x) is g.f. of A050325.`
	CROSSREFS	`Cf. A002955, A002988-A002992, A052318-A052329.` `Adjacent sequences: A052323 A052324 A052325 this_sequence A052327 A052328 A052329` `Sequence in context: A067605 A072986 A079047 this_sequence A079118 A034466 A007186`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Dec 15 1999.`
	EXTENSIONS	`More terms, formula and comments from Christian G. Bower (bowerc(AT)usa.net), Dec 15 1999.`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.

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