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A302444
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Expansion of e.g.f. arcsinh(x)/cos(x) (odd powers only).
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3
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1, 2, 24, 216, 15936, -77056, 90991744, -8523712768, 2731708067840, -684815907467264, 268028469798256640, -114888252320482000896, 62022733722259702579200, -38635369828053720937463808, 28349537098304682205749968896, -23874826868622028919177351004160
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = (2*n+1)! * [x^(2*n+1)] arcsinh(x)/cos(x).
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EXAMPLE
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arcsinh(x)/cos(x) = x/1! + 2*x^3/3! + 24*x^5/5! + 216*x^7/7! + 15936*x^9/9! - 77056*x^11/11! + ...
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MATHEMATICA
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nmax = 16; Table[(CoefficientList[Series[ArcSinh[x]/Cos[x], {x, 0, 2 nmax + 1}], x] Range[0, 2 nmax + 1]!)[[n]], {n, 2, 2 nmax, 2}]
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CROSSREFS
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Cf. A000182, A000364, A000795, A001818, A002084, A003701, A003702, A012821, A296742, A301942, A302542, A302543.
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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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