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A013523
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Denominator of [x^(2n+1)] in the Taylor expansion arcsinh(cosec(x)-cot(x))= x/2 +x^3/48 +x^5/768 +61*x^7/645120 +277*x^9/37158912 +..
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0
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2, 48, 768, 645120, 37158912, 81749606400, 784796221440, 42849873690624000, 548478383239987200, 63777066403145711616000, 4285818862291391820595200, 216862434431944426122117120000, 8007228348256409579893555200000, 1461479318123759876522171695104000000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Numerators are apparently covered by A091912.
The e.g.f. of x/2, arcsinh(cosec(x)-cot(x)) = x/(2^1*1!) + x^3/(2^3*3!) +5*x^5/(2^5*5!) +61*x^7/(2^7*7!) +1385*x^9/(2^9*9!) +... is apparently provided by the absolute values of A028296.
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CROSSREFS
| Sequence in context: A005429 A035606 A157057 * A009670 A024236 A119703
Adjacent sequences: A013520 A013521 A013522 * A013524 A013525 A013526
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KEYWORD
| nonn,frac
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AUTHOR
| Patrick Demichel (patrick.demichel(AT)hp.com)
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EXTENSIONS
| Values replaced by denominators. - R. J. Mathar, Dec 19 2011
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