E.g.f. log(1+sin(tan(x))).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =3a(4) =-10a(5) =41a(6) =-232a(7) =1299a(8) =-10064a(9) =74609a(10) =-720384a(11) =6787811a(12) =-78009600a(13) =898506649a(14) =-11977120768a(15) =163241051315