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%I A009097 #23 Sep 08 2022 08:44:37
%S A009097 1,0,-2,3,-3,10,-56,315,-1971,13788,-105246,857615,-7266223,61296222,
%T A009097 -465353292,1982748495,36246192441,-1600097656520,43901543199046,
%U A009097 -1078930450441413,25757481055625541,-615789512284527630
%N A009097 Expansion of e.g.f. cos(x)*cos(log(1+x)).
%H A009097 Vincenzo Librandi, <a href="/A009097/b009097.txt">Table of n, a(n) for n = 0..100</a>
%t A009097 With[{nn=30},CoefficientList[Series[Cos[x]*Cos[Log[1+x]],{x,0,nn}],x] Range[0,nn]!] (* _Harvey P. Dale_, Jun 24 2014 *)
%o A009097 (PARI) x='x+O('x^30); Vec(serlaplace(cos(x)*cos(log(1+x)))) \\ _G. C. Greubel_, Jul 26 2018
%o A009097 (Magma) m:=30; R<x>:=PowerSeriesRing(Rationals(), m); b:=Coefficients(R!(Cos(x)*Cos(Log(1+x)))); [Factorial(n-1)*b[n]: n in [1..m]]; // _G. C. Greubel_, Jul 26 2018
%K A009097 sign,easy
%O A009097 0,3
%A A009097 _R. H. Hardin_
%E A009097 Extended with signs by _Olivier Gérard_, Mar 15 1997
%E A009097 Prior Mathematica program replaced by _Harvey P. Dale_, Jun 24 2014

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