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A006612 Number of n-node bipartite graphs not determined by their spectra.
(Formerly M1654)
0
0, 0, 0, 0, 2, 6, 21, 75, 411, 2114, 13529, 108243 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

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..12.

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).

CROSSREFS

Sequence in context: A105872 A304781 A148490 * A116769 A294817 A294772

Adjacent sequences:  A006609 A006610 A006611 * A006613 A006614 A006615

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

a(10)-a(12) from Sean A. Irvine, May 15 2017

STATUS

approved

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Last modified November 20 21:05 EST 2018. Contains 317422 sequences. (Running on oeis4.)