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A009055
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Expansion of e.g.f. cos(sinh(tan(x))), even terms only.
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1
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1, -1, -11, -253, -9463, -491609, -30257347, -1480493589, 177416283793, 125705754161615, 53738108098148101, 22477151211215445843, 9977406312993326490265, 4802660699035958910256759
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OFFSET
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0,3
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LINKS
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MAPLE
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seq(coeff(series(factorial(n)*cos(sinh(tan(x))), x, n+1), x, n), n=0..30, 2); # Muniru A Asiru, Jul 24 2018
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MATHEMATICA
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With[{nmax = 60}, CoefficientList[Series[Cos[Sinh[Tan[x]]], {x, 0, nmax}], x]*Range[0, nmax]!][[1 ;; -1 ;; 2]] (* G. C. Greubel, Jul 23 2018 *)
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PROG
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(PARI) x='x+O('x^60); v=Vec(serlaplace(cos(sinh(tan(x))))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Jul 23 2018
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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