Expansion of e.g.f. log(sec(x) + sinh(x)).

Terms

a(0) =0a(1) =1a(2) =0a(3) =0a(4) =4a(5) =-20a(6) =120a(7) =-560a(8) =2784a(9) =-7920a(10) =-24960a(11) =1034880a(12) =-14625536a(13) =172569280a(14) =-1661936640a(15) =12339608320a(16) =-13269651456