Expansion of tan(sin(x)/cosh(x)).A009674Expansion of tan(sin(x)/cosh(x)).Terms a(0) =1a(1) =-2a(2) =-28a(3) =1160a(4) =-3504a(5) =-3908896a(6) =360691008a(7) =14544047232External referencesoeis: A009674