A003093 - OEIS

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A003093

Number of planar 2-trees with n nodes.
(Formerly M1977)

1, 2, 10, 83, 690, 6412, 61842, 457025 (list; graph; refs; listen; history; internal format)

	OFFSET	`3,2`
	REFERENCES	`E. M. Palmer and R. C. Read, on the number of plane 2-trees, J. Lond. Math. Soc., 6 (1973), 583-592.` `N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).`
	LINKS	`Index entries for sequences related to trees`
	CROSSREFS	`Sequence in context: A112487 A089469 A111265 * A006679 A050390 A101878` `Adjacent sequences: A003090 A003091 A003092 * A003094 A003095 A003096`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.