Expansion of cos(log(1+x)/cos(x)).

Terms

a(0) =1a(1) =0a(2) =-1a(3) =3a(4) =-22a(5) =100a(6) =-700a(7) =3990a(8) =-28628a(9) =171288a(10) =-1025420a(11) =1661660a(12) =78215392a(13) =-2266954560a(14) =46180065256a(15) =-873515610240