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

Terms

a(0) =0a(1) =1a(2) =0a(3) =-3a(4) =16a(5) =-35a(6) =0a(7) =1057a(8) =-9984a(9) =59865a(10) =0a(11) =-5446683a(12) =85897216a(13) =-726781835a(14) =0a(15) =133713611977a(18) =0a(22) =0