Expansion of log(1+tan(x))*cosh(x).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =7a(4) =-20a(5) =125a(6) =-721a(7) =5731a(8) =-49440a(9) =505529a(10) =-5716921a(11) =72560255a(12) =-1009426340a(13) =15366052533a(14) =-253286287801