A099881 - OEIS

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A099881

Number of pairs of n-node simple graphs that are isospectral (excluding triples, etc.).

0, 0, 0, 0, 1, 5, 52, 771, 21025 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,6`
	LINKS	`Eric Weisstein's World of Mathematics, Isospectral Graphs`
	CROSSREFS	`Cf. A099882, A099883.` `Sequence in context: A193809 A134111 A071583 * A196531 A108459 A076281` `Adjacent sequences: A099878 A099879 A099880 * A099882 A099883 A099884`
	KEYWORD	`nonn,more`
	AUTHOR	`Eric Weisstein (eric(AT)weisstein.com), Oct 28, 2004`

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Last modified February 17 15:57 EST 2012. Contains 206050 sequences.