id:A052301 - OEIS Search Results

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Number of asymmetric rooted Greg trees.

+0
4

1, 1, 2, 5, 14, 43, 138, 455, 1540, 5305, 18546, 65616, 234546, 845683, 3072350, 11235393, 41326470, 152793376, 567518950, 2116666670, 7924062430, 29765741831, 112157686170, 423809991041, 1605622028100, 6097575361683 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`A rooted Greg tree can be described as a rooted tree with 2-colored nodes where only the black nodes are counted and the white nodes have at least 2 children.`
	LINKS	`Index entries for sequences related to rooted trees` `N. J. A. Sloane, Transforms`
	FORMULA	`Satisfies a=WEIGH(a)+SHIFT_RIGHT(WEIGH(a))-a.`
	CROSSREFS	`Essentially the same as A031148. Cf. A005263, A005264, A048159, A048160, A052300-A052303.` `Sequence in context: A071743 A071747 A071751 this_sequence A071755 A149879 A149880` `Adjacent sequences: A052298 A052299 A052300 this_sequence A052302 A052303 A052304`
	KEYWORD	`nonn,eigen`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Nov 15 1999.`

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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.

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