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A351779
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a(n) = n! * Sum_{k=0..n} (-n)^(n-k) * (n-k)^k/k!.
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3
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1, -1, 4, -63, 2288, -138525, 12381084, -1528482823, 249005711296, -51739455340953, 13353206066063900, -4190486732316600771, 1571373340568392914288, -693899460077821703051125, 356404409990391961980227068, -210670220153918100996704166975
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) = n! * [x^n] 1/(1 + n*x*exp(x)).
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PROG
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(PARI) a(n) = n!*sum(k=0, n, (-n)^(n-k)*(n-k)^k/k!);
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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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