id:A055291 - OEIS Search Results

Search: id:A055291

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Number of trees with n nodes and 4 leaves.

+0
2

1, 2, 4, 8, 14, 23, 36, 54, 78, 110, 150, 201, 264, 341, 433, 544, 674, 827, 1004, 1209, 1443, 1711, 2013, 2355, 2738, 3167, 3643, 4173, 4757, 5402, 6109, 6885, 7731, 8655, 9657, 10746, 11923, 13196, 14566, 16043, 17627, 19328, 21147, 23094 (list; graph; listen)

	OFFSET	`5,2`
	LINKS	`Index entries for sequences related to trees`
	FORMULA	`G.f.: x^5(x^5+x^3+1)/[(1-x^3)(1+x^2)(1-x^2)^2(1-x)^2].`
	CROSSREFS	`Column 4 of A055290.` `Adjacent sequences: A055288 A055289 A055290 this_sequence A055292 A055293 A055294` `Sequence in context: A053798 A138526 A089054 this_sequence A091773 A107055 A018153`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), May 09 2000`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

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