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A167386
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a(n) = (-1)^n*n*(n+1)*(2*n-5)/6.
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1
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1, -1, -2, 10, -25, 49, -84, 132, -195, 275, -374, 494, -637, 805, -1000, 1224, -1479, 1767, -2090, 2450, -2849, 3289, -3772, 4300, -4875, 5499, -6174, 6902, -7685, 8525, -9424, 10384, -11407, 12495, -13650, 14874, -16169, 17537, -18980, 20500, -22099, 23779
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OFFSET
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1,3
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LINKS
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FORMULA
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a(n) = -4*a(n-1) - 6*a(n-2) - 4*a(n-3) - a(n-4).
G.f.: x*(1+3*x)/(1+x)^4.
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MATHEMATICA
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PROG
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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EXTENSIONS
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Note that for a sequence in which every other term is zero, the OEIS policy is to omit those zeros. - N. J. A. Sloane, Nov 08 2009
Zeros removed by skipping even-indexed polynomials - R. J. Mathar, Nov 12 2009
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STATUS
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approved
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