sech(arcsin(x)*arcsin(x))=1-12/4!*x^4-240/6!*x^6-1008/8!*x^8...

A012351

sech(arcsin(x)*arcsin(x))=1-12/4!*x^4-240/6!*x^6-1008/8!*x^8...

Terms

    a(0) =1a(1) =0a(2) =-12a(3) =-240a(4) =-1008a(5) =378240a(6) =32163648a(7) =-363487488a(8) =-690754821888

External references