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A013090 sec(arcsinh(x)+arcsin(x))=1+4/2!*x^2+80/4!*x^4+4120/6!*x^6... 0

%I

%S 1,4,80,4120,394880,61069600,13845756800,4331363670400,

%T 1786609560320000,939754328209216000,613833877949676800000,

%U 487486352498634760960000,462560462591422971975680000

%N sec(arcsinh(x)+arcsin(x))=1+4/2!*x^2+80/4!*x^4+4120/6!*x^6...

%K nonn

%O 0,2

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

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Last modified January 29 05:05 EST 2023. Contains 359915 sequences. (Running on oeis4.)