A052302 - OEIS

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A052302

Greg trees.

1, 1, 1, 2, 5, 12, 37, 116, 412, 1526, 5995, 24284, 101619, 434402, 1893983, 8385952, 37637803, 170871486, 783611214, 3625508762, 16906577279, 79395295122, 375217952457, 1783447124452, 8521191260092, 40907997006020 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	COMMENTS	`A Greg tree can be described as a tree with 2-colored nodes where only the black nodes are counted and the white nodes are of degree at least 3.`
	LINKS	`Index entries for sequences related to trees`
	FORMULA	`G.f.: 1+B(x)-B(x)^2 where B(x) is g.f. of A052300.`
	CROSSREFS	`Cf. A005263, A005264, A048159, A048160, A052300-A052303.` `Sequence in context: A197444 A094717 A038142 * A009598 A002216 A024717` `Adjacent sequences: A052299 A052300 A052301 * A052303 A052304 A052305`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Nov 15 1999.`

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.