id:A007142 - OEIS Search Results

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

+0
1

1, 3, 15, 73, 387, 2106 (list; graph; listen)

	OFFSET	`1,2`
	REFERENCES	`N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).` `G. Gati, F. Harary and R. W. Robinson, Line colored trees with extendable automorphisms, Acta Math. Scientia, 2 (1982), 105-110.`
	LINKS	`Index entries for sequences related to trees`
	CROSSREFS	`Sequence in context: A145839 A055837 A124543 this_sequence A151326 A063000 A002902` `Adjacent sequences: A007139 A007140 A007141 this_sequence A007143 A007144 A007145`
	KEYWORD	`nonn,more`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.