

A006612


Number of nnode bipartite graphs not determined by their spectra.
(Formerly M1654)


0



0, 0, 0, 0, 2, 6, 21, 75, 411, 2114, 13529, 108243
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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. 7392 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



