Expansion of sqrt( cosh(x) / cos(x) ) = Sum_{n>=0} a(n) * x^(2n) / (2n)!.
A273378
Expansion of sqrt( cosh(x) / cos(x) ) = Sum_{n>=0} a(n) * x^(2n) / (2n)!.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =31a(4) =553a(5) =18961a(6) =874203a(7) =62142991a(8) =5423159953a(9) =655008561121
External references
- oeis: A273378