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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =5a(4) =-18a(5) =121a(6) =-792a(7) =7013a(8) =-66640a(9) =752785a(10) =-9320704a(11) =129763589a(12) =-1972346112a(13) =32812992265a(14) =-590188526592