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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =3a(4) =0a(5) =-5a(6) =105a(7) =-203a(8) =392a(9) =16245a(10) =-117765a(11) =957671a(12) =-385176a(13) =-34555105a(14) =764774101a(15) =-4852910775a(16) =9796998000a(17) =823102605865