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A082104
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Number of unique characteristic polynomials among all simple undirected graphs on n nodes.
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0
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1, 2, 4, 11, 33, 151, 988, 11453, 247357, 10608128, 901029366, 148187993520
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Andries E. Brouwer, Numbers of characteristic polynomials and cospectral graphs for A
A. E. Brouwer and E. Spence, Cospectral graphs on 12 vertices, Electr. J. Combin. 16 (2009) N20. (p. 199).
E. Spence, Numbers of characteristic polynomials and cospectral graphs for A
Eric Weisstein's World of Mathematics, Characteristic Polynomial
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CROSSREFS
| Cf. A000088.
Sequence in context: A123450 A052431 A076316 * A099215 A089407 A071115
Adjacent sequences: A082101 A082102 A082103 * A082105 A082106 A082107
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KEYWORD
| nonn,hard,more
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com), Apr 03, 2003
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EXTENSIONS
| Added one term A.E. Brouwer (aeb(AT)cwi.nl), Apr 09 2009
Two more terms from Ruperto Corso (rupertocorsoto(AT)gmail.com), Dec 18 2011
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