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A089476
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Number of different values taken by the permanent of a real singular (0,1)-matrix of order n.
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2
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OFFSET
| 1,2
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EXAMPLE
| a(4)=10 because the permanents of singular (0, 1)-matrices can take the values 0, 2, 4, 6, 8, 10, 12, 14, 18, 24.
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CROSSREFS
| A089475 gives different permanents of nonsingular (0, 1)-matrices, A089481 occurrence counts for permanents of singular (0, 1)-matrices, A087983 different permanents of all (0, 1)-matrices.
Sequence in context: A056593 A154219 A173489 * A006397 A003422 A117402
Adjacent sequences: A089473 A089474 A089475 * A089477 A089478 A089479
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KEYWORD
| hard,nonn
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AUTHOR
| Hugo Pfoertner (hugo(AT)pfoertner.org), Nov 11 2003
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EXTENSIONS
| a(6) from Jaap Spies, Nov 28, 2003
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