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A054768
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a(n+2) = (2n+3)*a(n+1) + (n+1)^2*a(n).
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0
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-2, 1, 1, 9, 72, 792, 10512, 165168, 2992608, 61445088, 1409857920, 35751525120, 992877886080, 29970166769280, 976990865518080, 34206887786803200, 1280236466132467200, 51004766655793036800, 2155155171665039308800
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OFFSET
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0,1
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LINKS
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MATHEMATICA
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RecurrenceTable[{a[0]==-2, a[1]==1, a[n+2]==(2n+3)a[n+1]+(n+1)^2 a[n]}, a, {n, 20}] (* Harvey P. Dale, Dec 31 2017 *)
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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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STATUS
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approved
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