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A097625
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a(n) = Sum_{k=0..n} (-2)^k * binomial(2n-k,k) * (n-k)!.
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1
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-1, 0, 2, -4, 8, 0, 80, 544, 5248, 53504, 601344, 7339520, 96797696, 1371889664, 20797212672, 335835828224, 5755617771520, 104346351861760, 1995288143593472, 40135085601325056, 847203499270995968
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OFFSET
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1,3
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COMMENTS
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Permanent of certain n X 2 Toeplitz-(1,-1) matrices.
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LINKS
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MAPLE
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A097625 := proc(n) add((-2)^k*(n-k)!*binomial(2*n-k, k), k=0..n) ; end proc:
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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