A038056 - OEIS

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A038056

Number of trees with 2-colored nodes.

2, 3, 6, 18, 54, 189, 700, 2778, 11486, 49377, 217936, 984818, 4533004, 21198962, 100471862, 481754806, 2333465628, 11404047817, 56177574628, 278710061814, 1391617108600, 6988781174376, 35283390923324, 178990052273558 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	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 A038055.`
	CROSSREFS	`Cf. A000055, A038055-A038062.` `Sequence in context: A057581 A089424 A083563 * A072241 A093468 A185625` `Adjacent sequences: A038053 A038054 A038055 * A038057 A038058 A038059`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Jan 04 1999.`

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Last modified February 15 20:26 EST 2012. Contains 205852 sequences.