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A009047 Expansion of cos(sin(x)*cosh(x)), even terms only. 1

%I #18 Jul 24 2018 02:58:42

%S 1,-1,-7,23,1297,-6129,-894903,829671,1879275169,1886150559,

%T -7580265762535,-85001467923145,61409100961369265,1056714909891968687,

%U -781355567634874555799,-25440890573992236442361

%N Expansion of cos(sin(x)*cosh(x)), even terms only.

%H G. C. Greubel, <a href="/A009047/b009047.txt">Table of n, a(n) for n = 0..250</a>

%t With[{nn=30},Take[CoefficientList[Series[Cos[Sin[x]*Cosh[x]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Nov 12 2017 *)

%o (PARI) x='x+O('x^50); v=Vec(serlaplace(cos(sin(x)*cosh(x)))); vector(#v\2,n,v[2*n-1]) \\ _G. C. Greubel_, Jul 23 2018

%K sign

%O 0,3

%A _R. H. Hardin_

%E Extended with signs by _Olivier GĂ©rard_, Mar 15 1997

%E Previous Mathematica program replaced by _Harvey P. Dale_, Nov 12 2017

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Last modified February 29 10:48 EST 2024. Contains 370424 sequences. (Running on oeis4.)