A086510 - OEIS

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A086510

Number of n X n real (0,1)-matrices with all eigenvalues >= 0.

1, 2, 13, 261, 15418 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	LINKS	`B. D. McKay, F. E. Oggier, G. F. Royle, N. J. A. Sloane, I. M. Wanless and H. S. Wilf, Acyclic digraphs and eigenvalues of (0,1)-matrices` `B. D. McKay, F. E. Oggier, G. F. Royle, N. J. A. Sloane, I. M. Wanless and H. S. Wilf, Acyclic digraphs and eigenvalues of (0,1)-matrices, J. Integer Sequences, 7 (2004), #04.3.3.` `Index entries for sequences related to binary matrices`
	CROSSREFS	`Cf. A003024, A055165, A085656.` `Sequence in context: A133067 A042677 A134296 * A123113 A126742 A013051` `Adjacent sequences: A086507 A086508 A086509 * A086511 A086512 A086513`
	KEYWORD	`nonn,more`
	AUTHOR	`Frederique Oggier (frederique.oggier(AT)epfl.ch) and N. J. A. Sloane (njas(AT)research.att.com), Sep 10 2003`

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Last modified February 13 10:39 EST 2012. Contains 205459 sequences.