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A109582
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Expansion of e.g.f.: -1/(1+x-x^3).
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0
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-1, 1, -2, 0, 24, -240, 1440, -5040, -40320, 1088640, -14515200, 119750400, 0, -24908083200, 610248038400, -9153720576000, 62768369664000, 1422749712384000, -70426110763008000, 1703031405723648000, -24329020081766400000, -51090942171709440000
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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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E.g.f.: -1/(1+x-x^3).
D-finite with recurrence a(n) +n*a(n-1) -n*(n-1)*(n-2)*a(n-3) = 0. - R. J. Mathar, Aug 20 2021
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MAPLE
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g:=-1/(1+x-x^3):gser:=series(g, x=0, 26): -1, seq(n!*coeff(gser, x^n), n=1..22);
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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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