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A349902
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a(n) = Sum_{k=0..n} (-1)^(n-k) * k^(3*n).
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2
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1, 1, 63, 19172, 16249870, 29458152441, 97813591721181, 537081363012854224, 4535464309375188976956, 55796581668379082029481225, 958824462567528346234944706075, 22255431432328421226838750870120356, 678866987929798923743810982299237129610
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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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G.f.: Sum_{k>=0} (k^3 * x)^k/(1 + k^3 * x).
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MATHEMATICA
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Join[{1}, Table[Sum[(-1)^(n-k) k^(3n), {k, 0, n}], {n, 20}]] (* Harvey P. Dale, Apr 12 2022 *)
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PROG
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(PARI) a(n) = sum(k=0, n, (-1)^(n-k)*k^(3*n));
(PARI) my(N=20, x='x+O('x^N)); Vec(sum(k=0, N, (k^3*x)^k/(1+k^3*x)))
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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