sech(sin(sinh(x)))=1-1/2!*x^2+5/4!*x^4-13/6!*x^6-407/8!*x^8...

A012033

sech(sin(sinh(x)))=1-1/2!*x^2+5/4!*x^4-13/6!*x^6-407/8!*x^8...

Terms

    a(0) =1a(1) =-1a(2) =5a(3) =-13a(4) =-407a(5) =30151a(6) =-1142483a(7) =19202427a(8) =3747342929a(9) =-722092683505

External references