Expansion of e.g.f. cos(log(1+tanh(x))).

Terms

a(0) =1a(1) =0a(2) =-1a(3) =3a(4) =-2a(5) =-20a(6) =74a(7) =98a(8) =-1532a(9) =960a(10) =41324a(11) =-105732a(12) =-1595912a(13) =7998640a(14) =85401224a(15) =-705417112a(16) =-6026865392a(17) =76352075520a(18) =537223559024