378759492257domain: NAppears in sequencesExpansion of e.g.f. exp(sec(x)*arcsinh(x)).at n=16A012821cosh(sec(x)*arcsinh(x))=1+1/2!*x^2+9/4!*x^4+225/6!*x^6+6993/8!*x^8...at n=8A012831