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A012344
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cos(arcsin(x)*arcsin(x))=1-12/4!*x^4-240/6!*x^6-7728/8!*x^8...
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1
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1, 0, -12, -240, -7728, -428160, -37912512, -4960720128, -901797013248, -217415865765888, -67097095431416832, -25783170924788428800, -12066773451365568000000, -6755136268249010663424000
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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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a(n) ~ -sqrt(Pi) * sin(Pi^2/4) * (2*n)! / (2 * n^(3/2)). - Vaclav Kotesovec, Feb 08 2015
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EXAMPLE
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cos(arcsin(x)*arcsin(x)) = 1 - 12/4!*x^4 - 240/6!*x^6 - 7728/8!*x^8 + ...
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MATHEMATICA
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nn = 20; Table[(CoefficientList[Series[Cos[ArcSin[x]^2], {x, 0, 2*nn}], x] * Range[0, 2*nn]!)[[n]], {n, 1, 2*nn+1, 2}] (* Vaclav Kotesovec, Feb 08 2015 *)
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PROG
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(PARI) x='x+O('x^50); v=Vec(serlaplace(cos(asin(x)*asin(x)))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Apr 11 2017
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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Patrick Demichel (patrick.demichel(AT)hp.com)
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STATUS
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approved
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