sech(arctan(x)*arcsin(x))=1-12/4!*x^4+120/6!*x^6-1008/8!*x^8...

A012443

sech(arctan(x)*arcsin(x))=1-12/4!*x^4+120/6!*x^6-1008/8!*x^8...

Terms

    a(0) =1a(1) =0a(2) =-12a(3) =120a(4) =-1008a(5) =-45120a(6) =-11491392a(7) =1378925184a(8) =-443544192768

External references