id:A001385 - OEIS Search Results

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Number of n-node trees of height at most 5.
(Formerly M1177 N0453)

+0
5

1, 1, 1, 2, 4, 9, 20, 47, 108, 252, 582, 1345, 3086, 7072, 16121, 36667, 83099, 187885, 423610, 953033, 2139158, 4792126, 10714105, 23911794, 53273599, 118497834, 263164833, 583582570, 1292276355, 2857691087, 6311058671, 13919982308 (list; graph; listen)

	OFFSET	`0,4`
	REFERENCES	`J. Riordan, Enumeration of trees by height and diameter, IBM J. Res. Dev. 4 (1960), 473-478.`
	LINKS	`N. J. A. Sloane, Table of n, a(n) for n=0..200` `N. J. A. Sloane, Transforms` `Index entries for sequences related to rooted trees` `Index entries for sequences related to trees`
	FORMULA	`Take Euler transform of A001384 and shift right. (Christian G. Bower (bowerc(AT)usa.net)).`
	MAPLE	`For Maple program see link in A000235.`
	CROSSREFS	`See A001383 for details.` `Adjacent sequences: A001382 A001383 A001384 this_sequence A001386 A001387 A001388` `Sequence in context: A110198 A104508 A036623 this_sequence A039808 A138164 A130802`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified May 16 01:24 EDT 2008. Contains 139630 sequences.

AT&T Labs Research