Expansion of e.g.f.: sech(exp(x)*log(x+1)).

Terms

a(0) =1a(1) =0a(2) =-1a(3) =-3a(4) =-6a(5) =30a(6) =270a(7) =1400a(8) =-3080a(9) =-86184a(10) =-893760a(11) =-754688a(12) =61595424a(13) =1201314400a(14) =5341239904a(15) =-68598744240