A038060 - OEIS

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A038060

Number of trees with 3-colored nodes.

1, 3, 6, 18, 75, 342, 1773, 9894, 58596, 362061, 2314119, 15185223, 101830986, 695253993, 4819762446, 33851833506, 240472935735, 1725315714729, 12487872432924, 91097741283408, 669227023979088, 4947500029023540 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	LINKS	`Index entries for sequences related to trees`
	FORMULA	`G.f.: B(x)-B^2(x)/2+B(x^2)/2, where B(x) is g.f. for A038059.`
	CROSSREFS	`Cf. A000055, A038055-A038062.` `Equals 3 * A006965(n).` `Sequence in context: A178789 A102962 A076510 * A135504 A057268 A085401` `Adjacent sequences: A038057 A038058 A038059 * A038061 A038062 A038063`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Jan 04 1999.`

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Last modified February 17 14:50 EST 2012. Contains 206050 sequences.