A085619 - OEIS

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A085619

Number of 2-graphs with n nodes and integral spectrum.

2, 2, 4, 8, 9, 16 (list; graph; refs; listen; history; internal format)

	OFFSET	`4,1`
	REFERENCES	`F. C. Bussemaker, R. A. Mathon and J. J. Seidel, Tables of two-graphs, T.H.-Report 79-WSK-05, Technological University Eindhoven, Dept. Mathematics, 1979; also pp. 71-112 of "Combinatorics and Graph Theory (Calcutta, 1980)", Lect. Notes Math. 885, 1981.`
	CROSSREFS	`Cf. A002854.` `Sequence in context: A132007 A094605 * A085620 A050047 A056381 A019463` `Adjacent sequences: A085616 A085617 A085618 * A085620 A085621 A085622`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Jul 11 2003`

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Last modified February 15 10:56 EST 2012. Contains 205763 sequences.