Expansion of sin(cosh(x)*x).A009447Expansion of sin(cosh(x)*x).Terms a(0) =1a(1) =2a(2) =-24a(3) =-624a(4) =-7424a(5) =242560a(6) =23499776a(7) =1002251264a(8) =-2151563264External referencesoeis: A009447