

A009186


Expansion of e.g.f.: cosh(x)/exp(tan(x)).


1



1, 1, 2, 6, 16, 72, 328, 1848, 11712, 81088, 638720, 5318016, 49459840, 483162240, 5159926528, 57865303296, 697030680576, 8815813734400, 118233272496128, 1662921003208704, 24578235697610752, 380141599264751616, 6139851821419921408
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OFFSET

0,3


LINKS



MAPLE

a:= n> n! * coeff (series (cosh(x)/exp(tan(x)), x, n+1), x, n):


MATHEMATICA

With[{nn=30}, CoefficientList[Series[Cosh[x]/Exp[Tan[x]], {x, 0, nn}], x] Range[0, nn]!] Harvey P. Dale, May 16 2012


CROSSREFS



KEYWORD

sign,easy


AUTHOR



EXTENSIONS



STATUS

approved



