A036648 - OEIS

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A036648

Number of centered 5-valent trees with n nodes.

0, 1, 0, 1, 1, 2, 3, 6, 11, 24, 48, 109, 242, 574, 1346, 3258, 7928, 19664, 49158, 124384, 316791, 813231, 2099326, 5451613, 14226697, 37306971, 98247737, 259779698, 689385447, 1835644498, 4902992215, 13133825317, 35276818036 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,6`
	LINKS	`E. M. Rains and N. J. A. Sloane, On Cayley's Enumeration of Alkanes (or 4-Valent Trees)., J. Integer Sequences, Vol. 2 (1999), Article 99.1.1.` `Index entries for sequences related to trees`
	CROSSREFS	`Sequence in context: A006787 A176425 A000992 * A047750 A072187 A122852` `Adjacent sequences: A036645 A036646 A036647 * A036649 A036650 A036651`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 14 05:41 EST 2012. Contains 205570 sequences.