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A012254
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exp(arcsinh(arctanh(x)))=1+x+1/2!*x^2+2/3!*x^3+5/4!*x^4+24/5!*x^5...
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3
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1, 1, 1, 2, 5, 24, 109, 720, 4521, 40320, 330681, 3628800, 36468717, 479001600, 5721101541, 87178291200, 1205289090513, 20922789888000, 328897528901361, 6402373705728000, 112769846051251797, 2432902008176640000
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OFFSET
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0,4
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LINKS
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FORMULA
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E.g.f.: Q(0)-1, where Q(k) = 2 + arctanh(x)/(1 - arctanh(x)/Q(k+1) ); (continued fraction). - Sergei N. Gladkovskii, Dec 19 2013
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CROSSREFS
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KEYWORD
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nonn
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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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