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A006610 Number of n-node trees not determined by their spectra.
(Formerly M1959)
0
0, 0, 0, 0, 0, 0, 0, 2, 10, 8, 60, 119, 415, 826, 2470, 5246, 14944, 32347, 84118 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

REFERENCES

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..19.

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).

Index entries for sequences related to trees

CROSSREFS

Sequence in context: A316967 A189711 A092939 * A227716 A033839 A196367

Adjacent sequences:  A006607 A006608 A006609 * A006611 A006612 A006613

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Existing terms verified and a(19) from Sean A. Irvine, May 14 2017

STATUS

approved

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Last modified April 19 20:04 EDT 2019. Contains 322291 sequences. (Running on oeis4.)