Expansion of exp(tanh(x)/cosh(x)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =-4a(4) =-19a(5) =12a(6) =517a(7) =1472a(8) =-18023a(9) =-159792a(10) =587529a(11) =16362304a(12) =19183749a(13) =-1834702400a(14) =-12219870323a(15) =218477736448