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

Terms

a(0) =1a(1) =1a(2) =0a(3) =1a(4) =1a(5) =-9a(6) =46a(7) =-125a(8) =-279a(9) =7021a(10) =-57644a(11) =247941a(12) =829225a(13) =-30119309a(14) =346210866a(15) =-2030635529a(16) =-9055135439a(17) =430103734425