A007141 - OEIS

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A007141

E-trees with at most 2 colors.
(Formerly M1757)

1, 2, 7, 22, 75, 250, 886, 3150 (list; graph; refs; listen; history; text; 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	`Table of n, a(n) for n=1..8.` `Index entries for sequences related to trees`
	CROSSREFS	`Sequence in context: A137398 A151439 A204218 * A090831 A174403 A119975` `Adjacent sequences: A007138 A007139 A007140 * A007142 A007143 A007144`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane.`
	STATUS	`approved`

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Last modified June 19 12:57 EDT 2013. Contains 226404 sequences.