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A279046
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a(n) = A000178(n) * Sum_{k=0..n} (-1)^k/k!.
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1
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1, 0, 1, 4, 108, 12672, 9158400, 46133452800, 1860226228224000, 675033837113180160000, 2449564623049780415692800000, 97778774486746890792389836800000000, 46836189690981206780971946461888512000000000, 291649927271171583734813938085106400257638400000000000
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OFFSET
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0,4
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LINKS
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FORMULA
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a(0) = 1, a(n) = n! * a(n-1) + (-1)^n * A000178(n-1).
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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