Expansion of e.g.f.: sinh(tan(log(1+x))).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =5a(4) =-24a(5) =166a(6) =-1350a(7) =13026a(8) =-143808a(9) =1790560a(10) =-24782400a(11) =377280056a(12) =-6262125936a(13) =112504698840