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A215680
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n-th derivative of sec(x)^tan(x) at x=0.
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1
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1, 0, 0, 3, 0, 30, 90, 588, 5040, 26520, 325080, 2158728, 27731880, 249259920, 3181258080, 36821629848, 482278043520, 6704476956480, 93675256079040, 1479108131816448, 22566722722104960, 390679249452835200, 6559255213047250560, 122197022127873558528
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OFFSET
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0,4
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COMMENTS
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sec(x) = 1/cos(x).
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LINKS
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FORMULA
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E.g.f.: sec(x)^tan(x).
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MAPLE
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a:= n-> n!* coeff(series(sec(x)^tan(x), x, n+1), x, n):
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MATHEMATICA
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f[x_] := Sec[x]^Tan[x]; Table[Derivative[n] [f][0], {n, 0, 25}]
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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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