Expansion of log(1+x)*cosh(tan(x)).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =5a(4) =-12a(5) =89a(6) =-345a(7) =3093a(8) =-17136a(9) =178065a(10) =-1313865a(11) =15537125a(12) =-145520364a(13) =1937055977a(14) =-22215578385a(15) =330407321013