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A012450
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arcsinh(arctan(x)*tan(x))=2/2!*x^2+40/6!*x^6-2688/8!*x^8+210208/10!*x^10...
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1
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2, 0, 40, -2688, 210208, -13038080, 2241915520, -589026013184, 146361182839296, -42690102749216768, 18963982821764573184, -10109322351828827471872, 5702647873782168851521536
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OFFSET
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1,1
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LINKS
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FORMULA
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a(n) = (2n)! [ x^(2n) ] arcsinh(arctan(x)*tan(x)).
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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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