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A013166 Expansion of e.g.f.: sech(arctanh(x)+log(x+1))=1-4/2!*x^2+6/3!*x^3+45/4!*x^4-300/5!*x^5... 0

%I #6 Jan 10 2019 12:08:37

%S 1,0,-4,6,45,-300,-630,18270,-44415,-1428840,13608000,106964550,

%T -3044747475,2748645900,674525001150,-6848689097250,-138141621993375,

%U 3761985048822000,12387014410270500,-1765001060909336250

%N Expansion of e.g.f.: sech(arctanh(x)+log(x+1))=1-4/2!*x^2+6/3!*x^3+45/4!*x^4-300/5!*x^5...

%t With[{nn=20},CoefficientList[Series[Sech[ArcTanh[x]+Log[x+1]],{x,0,nn}],x] Range[0,nn]!] (* _Harvey P. Dale_, Jan 10 2019 *)

%K sign

%O 0,3

%A Patrick Demichel (patrick.demichel(AT)hp.com)

%E Definition clarified by _Harvey P. Dale_, Jan 10 2019

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Last modified May 30 10:22 EDT 2023. Contains 363050 sequences. (Running on oeis4.)