sec(tanh(x)*tan(x)) = 1+12/4!*x^4+14672/8!*x^8+120702912/12!*x^12...

A012674

sec(tanh(x)*tan(x)) = 1+12/4!*x^4+14672/8!*x^8+120702912/12!*x^12...

Terms

    a(0) =1a(1) =12a(2) =14672a(3) =120702912

External references