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Search: id:A085506
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| A085506 |
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Number of {-1,0,1} n X n matrices that have (real and) positive eigenvalues. |
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+0
2
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OFFSET
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1,2
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LINKS
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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.
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
Eric Weisstein's World of Mathematics, Positive Definite Matrix
Index entries for sequences related to binary matrices
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CROSSREFS
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Sequence in context: A152794 A053517 A114474 this_sequence A132508 A159355 A082212
Adjacent sequences: A085503 A085504 A085505 this_sequence A085507 A085508 A085509
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KEYWORD
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nonn,more
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AUTHOR
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Eric Weisstein (eric(AT)weisstein.com), Jul 02, 2003
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EXTENSIONS
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Offset corrected. - Max Alekseyev (maxale(AT)gmail.com), Oct 18 2008
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