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A012108
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cosh(arcsin(sinh(x)))=1+1/2!*x^2+9/4!*x^4+201/6!*x^6+9649/8!*x^8...
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0
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1, 1, 9, 201, 9649, 809201, 105268089, 19650225401, 4982657935329, 1648151554792801, 689411371817131369, 355814217290199455401, 222111401946937825176209, 164952387078229730219557201
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OFFSET
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0,3
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LINKS
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Table of n, a(n) for n=0..13.
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Cosh[ArcSin[Sinh[x]]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Mar 19 2015 *)
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CROSSREFS
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Sequence in context: A012168 A012133 A012038 * A251587 A103914 A211039
Adjacent sequences: A012105 A012106 A012107 * A012109 A012110 A012111
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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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