Expansion of exp(tan(x))/exp(x).

Terms

a(0) =1a(1) =0a(2) =0a(3) =2a(4) =0a(5) =16a(6) =40a(7) =272a(8) =1792a(9) =10176a(10) =97536a(11) =649472a(12) =7185024a(13) =59488768a(14) =710474752a(15) =7190574848a(16) =91774959616