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A009113 Expansion of e.g.f. cos(x)/exp(sinh(x)). 1
1, -1, 0, 1, 0, 3, -24, 61, -256, 1383, -5632, 28345, -156032, 808299, -4761600, 28955317, -178225152, 1188919631, -8081772544, 56978370417, -422364381184, 3196912985683, -25184814366720, 205147130407981, -1713906141986816 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..250

MATHEMATICA

With[{nmax = 30}, CoefficientList[Series[Cos[x]/Exp[Sinh[x]], {x, 0, nmax}], x]*Range[0, nmax]!] (* G. C. Greubel, Jul 26 2018 *)

PROG

(PARI) x='x+O('x^30); Vec(serlaplace(cos(x)/exp(sinh(x)))) \\ G. C. Greubel, Jul 26 2018

(MAGMA) m:=30; R<x>:=PowerSeriesRing(Rationals(), m); b:=Coefficients(R!(Cos(x)/Exp(Sinh(x)))); [Factorial(n-1)*b[n]: n in [1..m]]; // G. C. Greubel, Jul 26 2018

CROSSREFS

Sequence in context: A296273 A101008 A070734 * A152751 A162654 A092468

Adjacent sequences:  A009110 A009111 A009112 * A009114 A009115 A009116

KEYWORD

sign,easy

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

STATUS

approved

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Last modified April 22 14:20 EDT 2021. Contains 343177 sequences. (Running on oeis4.)