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A349894
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a(n) = Sum_{k=0..n} (-1)^(n-k) * k^(k*(n-k)).
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2
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1, 0, 1, -3, -10, 410, 42985, -6527829, -24060996846, -6613442955828, 3882375189467092921, 235121650953066124724477, -289337164954511885810252000250, -995208334663809003504695464745010282, 13325880481925983143500510271865447222057073
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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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G.f.: Sum_{k>=0} x^k/(1 + k^k * x).
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PROG
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(PARI) a(n) = sum(k=0, n, (-1)^(n-k)*k^(k*(n-k)));
(PARI) my(N=20, x='x+O('x^N)); Vec(sum(k=0, N, x^k/(1+k^k*x)))
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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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