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A012183 sec(tan(arctanh(x)))=1+1/2!*x^2+21/4!*x^4+1101/6!*x^6+107209/8!*x^8... 0

%I

%S 1,1,21,1101,107209,16711481,3810146205,1195529025861,494050576455185,

%T 260086639760540401,169928807728242392485,134924876918419856397501,

%U 127963083862513681084495321

%N sec(tan(arctanh(x)))=1+1/2!*x^2+21/4!*x^4+1101/6!*x^6+107209/8!*x^8...

%K nonn

%O 0,3

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

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Last modified March 25 01:17 EDT 2019. Contains 321450 sequences. (Running on oeis4.)