A106363 - OEIS

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A106363

Planar trees where no branch is identical to its adjacent neighbor.

1, 1, 0, 1, 0, 1, 3, 7, 14, 43, 115, 326, 931, 2719, 7979, 23804, 71418, 216444, 660276, 2028558, 6268350, 19479746, 60835542, 190881085, 601459251, 1902680249, 6040955223, 19245061851, 61503863732, 197135868680, 633615135842 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,7`
	LINKS	`Index entries for sequences related to trees`
	FORMULA	`G.f.: A(x) = B(x) + (C(x^2) - C(x)^2)/2. B(x) is g.f. of A106362. C(x) is g.f. of A106361.`
	CROSSREFS	`Cf. A002995.` `Sequence in context: A146936 A184264 A146155 * A128658 A001203 A154883` `Adjacent sequences: A106360 A106361 A106362 * A106364 A106365 A106366`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Apr 29 2005`

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Last modified February 17 17:51 EST 2012. Contains 206061 sequences.