sec(sinh(x)*arctan(x))=1+12/4!*x^4-120/6!*x^6+15120/8!*x^8...

A012564

sec(sinh(x)*arctan(x))=1+12/4!*x^4-120/6!*x^6+15120/8!*x^8...

Terms

    a(0) =1a(1) =0a(2) =12a(3) =-120a(4) =15120a(5) =-1003200a(6) =175323456a(7) =-30612097152

External references