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A012133 sech(arcsin(tanh(x)))=1-1/2!*x^2+9/4!*x^4-201/6!*x^6+8369/8!*x^8... 0

%I

%S 1,-1,9,-201,8369,-559601,54852729,-7411089401,1320161221089,

%T -299803443573601,84543945702681449,-28984920596097196201,

%U 11872728882101557841809,-5726623333843769342341201

%N sech(arcsin(tanh(x)))=1-1/2!*x^2+9/4!*x^4-201/6!*x^6+8369/8!*x^8...

%K sign

%O 0,3

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

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Last modified January 16 18:07 EST 2022. Contains 350376 sequences. (Running on oeis4.)