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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, 579, 1466
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,6
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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).
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CROSSREFS
| Sequence in context: A000622 A088028 A135960 * A007462 A053623 A035010
Adjacent sequences: A006608 A006609 A006610 * A006612 A006613 A006614
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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