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 A013098 tanh(arcsinh(x)+tan(x)) = 2*x-15/3!*x^3+457/5!*x^5-30289/7!*x^7... 1

%I #11 Nov 01 2013 16:12:39

%S 2,-15,457,-30289,3469345,-608926329,151766090881,-50946876706129,

%T 22157750605438913,-12118460218882345193,8139938757873193425313,

%U -6587354373887296232631681,6321346340322177807347908193

%N tanh(arcsinh(x)+tan(x)) = 2*x-15/3!*x^3+457/5!*x^5-30289/7!*x^7...

%H Vaclav Kotesovec, <a href="/A013098/b013098.txt">Table of n, a(n) for n = 0..200</a>

%F Limit n->infinity (|a(n)|/(2*n+1)!)^(1/(2*n+1)) = 1.2646735395769... - _Vaclav Kotesovec_, Nov 01 2013

%t Table[n!*SeriesCoefficient[Tanh[ArcSinh[x]+Tan[x]],{x,0,n}],{n,1,41,2}] (* _Vaclav Kotesovec_, Nov 01 2013 *)

%K sign

%O 0,1

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

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Last modified December 8 17:58 EST 2023. Contains 367680 sequences. (Running on oeis4.)