A007142 - OEIS

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A007142

E-trees with at most 3 colors.
(Formerly M2989)

1, 3, 15, 73, 387, 2106 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	REFERENCES	`G. Gati, F. Harary and R. W. Robinson, Line colored trees with extendable automorphisms, Acta Math. Scientia, 2 (1982), 105-110.` `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: A145839 A055837 A124543 * A190010 A151326 A063000` `Adjacent sequences: A007139 A007140 A007141 * A007143 A007144 A007145`
	KEYWORD	`nonn,more`
	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.