A006611 - OEIS

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A006611

Number of n-node forests not determined by their spectra.
(Formerly M1273)

0, 0, 0, 0, 0, 2, 4, 14, 38, 89, 234, 579, 1466 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,6`
	REFERENCES	`C. Godsil and B. D. McKay, Some computational results on the spectra of graphs, pp. 73-92 of Combinatorial Mathematics IV (Adelaide 1975), Lect. Notes Math., 560 (1976).` `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..13.`
	CROSSREFS	`Sequence in context: A088028 A135960 A216630 * A007462 A053623 A035010` `Adjacent sequences: A006608 A006609 A006610 * A006612 A006613 A006614`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane.`
	STATUS	`approved`

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Last modified May 25 03:00 EDT 2013. Contains 225634 sequences.