Expansion of e.g.f.: cos(log(1+x)/cosh(x)).

Terms

a(0) =1a(1) =0a(2) =-1a(3) =3a(4) =2a(5) =-20a(6) =-160a(7) =1470a(8) =-1412a(9) =-17208a(10) =-311900a(11) =5526620a(12) =-27336032a(13) =64471680a(14) =-3978938184a(15) =91242933600a(16) =-974175281648