cos(exp(x)-cos(x))=1-1/2!*x^2-6/3!*x^3-15/4!*x^4+183/6!*x^6...

Terms

a(0) =1a(1) =0a(2) =-1a(3) =-6a(4) =-15a(5) =0a(6) =183a(7) =1162a(8) =4305a(9) =4032a(10) =-75169a(11) =-720390a(12) =-4057119a(13) =-13316160a(14) =17994039a(15) =691795018a(16) =6706003809a(17) =45159313536a(18) =210202685567a(19) =247239745914