A036621 - OEIS

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A036621

Number of 6-ary rooted trees with n nodes and height at most 4.

1, 1, 1, 2, 4, 8, 15, 29, 52, 95, 168, 297, 513, 887, 1504, 2543, 4247, 7054, 11596, 18964, 30732, 49529, 79210, 125944, 198861, 312224, 487021, 755435, 1164641, 1785574, 2721591, 4125745, 6219019, 9324141, 13902921, 20620505, 30419742 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	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 rooted trees`
	CROSSREFS	`Sequence in context: A171857 A190160 A088532 * A001383 A108564 A066369` `Adjacent sequences: A036618 A036619 A036620 * A036622 A036623 A036624`
	KEYWORD	`nonn,fini`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 14 17:10 EST 2012. Contains 205644 sequences.