id:A000949 - OEIS Search Results

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Number of forests with n nodes and height at most 2.
(Formerly M3021 N1223)

+0
12

1, 3, 16, 101, 756, 6607, 65794, 733833, 9046648, 121961051, 1782690174, 28055070397, 472594822324, 8479144213191, 161340195463066, 3243707386310033, 68679247688467056, 1526976223741111987 (list; graph; listen)

	OFFSET	`1,2`
	REFERENCES	`J. Riordan, Forests of labeled trees, J. Combin. Theory, 5 (1968), 90-103.`
	FORMULA	`E.g.f.: exp(xexp(xexp(x))).`
	CROSSREFS	`Cf. A000248, A000950, A000951, A052512-A052514.` `Sequence in context: A137572 A009151 A009007 this_sequence A091637 A074542 A105622` `Adjacent sequences: A000946 A000947 A000948 this_sequence A000950 A000951 A000952`
	KEYWORD	`nonn`
	AUTHOR	`njas`
	EXTENSIONS	`More terms from Vladeta Jovovic (vladeta(AT)Eunet.yu), Apr 07 2001`

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Last modified December 4 21:35 EST 2008. Contains 151309 sequences.

AT&T Labs Research