Expansion of e.g.f.: cosh(tan(x)*log(1+x)).

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =12a(5) =-60a(6) =570a(7) =-3780a(8) =36960a(9) =-326592a(10) =3712200a(11) =-41836080a(12) =554861736a(13) =-7563345504a(14) =114963916704