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

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =12a(5) =-60a(6) =90a(7) =-420a(8) =12320a(9) =-124992a(10) =753480a(11) =-6481200a(12) =110644776a(13) =-1613081184a(14) =18917874976a(15) =-250425171360