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A012670 arctan(tanh(x)*tan(x))=2/2!*x^2-128/6!*x^6+253952/10!*x^10... 1

%I #7 Feb 24 2012 12:51:04

%S 2,-128,253952,-2863136768,107451055603712,-10140668012798148608,

%T 2022780765718183801782272,-757569427466144902069404827648

%N arctan(tanh(x)*tan(x))=2/2!*x^2-128/6!*x^6+253952/10!*x^10...

%F (-1)^n * 2^(6n+1) * A090681(n).

%K sign

%O 0,1

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

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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)