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A006611
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Number of n-node forests not determined by their spectra.
(Formerly M1273)
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0
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0, 0, 0, 0, 0, 2, 4, 14, 38, 89, 234, 581, 1471, 3560, 8940, 21229, 52876, 126393, 309993
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listen;
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OFFSET
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1,6
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COMMENTS
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Table 9 of Godsil and McKay gives incorrect a(12) = 579 and a(13) = 1466 (also has incorrect total number of forests). - Sean A. Irvine, May 15 2017
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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a(12) and a(13) corrected and a(14)-a(19) from Sean A. Irvine, May 15 2017
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STATUS
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approved
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