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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
(list; graph; refs; listen; history; internal format)
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