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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =-1a(4) =0a(5) =29a(6) =-105a(7) =139a(8) =-2072a(9) =31737a(10) =-247545a(11) =1824151a(12) =-22456104a(13) =313750293a(14) =-3929185169a(15) =51584719523a(16) =-793292190480