sech(sec(x)*arctanh(x))=1-1/2!*x^2-15/4!*x^4-225/6!*x^6+3297/8!*x^8...
A012852
sech(sec(x)*arctanh(x))=1-1/2!*x^2-15/4!*x^4-225/6!*x^6+3297/8!*x^8...
Terms
- a(0) =1a(1) =-1a(2) =-15a(3) =-225a(4) =3297a(5) =973695a(6) =99434577a(7) =3364479391
External references
- oeis: A012852