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

Terms

a(0) =1a(1) =0a(2) =-2a(3) =3a(4) =1a(5) =-30a(6) =164a(7) =-525a(8) =-391a(9) =22428a(10) =-206686a(11) =1039995a(12) =1161337a(13) =-96216978a(14) =1241356024a(15) =-8517557685a(16) =-12681799919