n-th derivative of sech(x)^tan(x) at x=0.

Terms

a(0) =1a(1) =0a(2) =0a(3) =-3a(4) =0a(5) =-10a(6) =90a(7) =-308a(8) =1680a(9) =-13560a(10) =123480a(11) =-788568a(12) =7646760a(13) =-76432720a(14) =841320480a(15) =-8436217208a(16) =103473901440