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

Terms

a(0) =0a(1) =1a(2) =-2a(3) =4a(4) =-23a(5) =163a(6) =-1339a(7) =13032a(8) =-146908a(9) =1883029a(10) =-27063486a(11) =431223780a(12) =-7546460679a(13) =143910464215