A006610 - OEIS

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A006610

Number of n-node trees not determined by their spectra.
(Formerly M1959)

0, 0, 0, 0, 0, 0, 0, 2, 10, 8, 60, 119, 415, 826, 2470, 5246, 14944, 32347 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,8`
	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	`Index entries for sequences related to trees`
	CROSSREFS	`Sequence in context: A166542 A189711 A092939 * A033839 A196367 A114264` `Adjacent sequences: A006607 A006608 A006609 * A006611 A006612 A006613`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 15 10:28 EST 2012. Contains 205763 sequences.