Expansion of e.g.f.: log(1+sinh(x)/cos(x)).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =6a(4) =-22a(5) =140a(6) =-976a(7) =8456a(8) =-83952a(9) =957840a(10) =-12249856a(11) =174293856a(12) =-2725714432a(13) =46514037440a(14) =-859767771136