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A009055 Expansion of e.g.f. cos(sinh(tan(x))), even terms only. 1
1, -1, -11, -253, -9463, -491609, -30257347, -1480493589, 177416283793, 125705754161615, 53738108098148101, 22477151211215445843, 9977406312993326490265, 4802660699035958910256759 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..234

MAPLE

seq(coeff(series(factorial(n)*cos(sinh(tan(x))), x, n+1), x, n), n=0..30, 2); # Muniru A Asiru, Jul 24 2018

MATHEMATICA

With[{nmax = 60}, CoefficientList[Series[Cos[Sinh[Tan[x]]], {x, 0, nmax}], x]*Range[0, nmax]!][[1 ;; -1 ;; 2]] (* G. C. Greubel, Jul 23 2018 *)

PROG

(PARI) x='x+O('x^60); v=Vec(serlaplace(cos(sinh(tan(x))))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Jul 23 2018

CROSSREFS

Sequence in context: A089298 A274129 A012154 * A009067 A128683 A292335

Adjacent sequences:  A009052 A009053 A009054 * A009056 A009057 A009058

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

STATUS

approved

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Last modified October 18 08:08 EDT 2019. Contains 328146 sequences. (Running on oeis4.)