Expansion of e.g.f.: tan(log(1+x)^2)/2.

Terms

a(0) =0a(1) =0a(2) =1a(3) =-3a(4) =11a(5) =-50a(6) =394a(7) =-4284a(8) =51708a(9) =-653904a(10) =8861256a(11) =-132180840a(12) =2186984040a(13) =-39706739280a(14) =779193951600