E.g.f.: 2*x*(1-log(1+2*x))/(2-log(1+2*x)).

Terms

a(0) =0a(1) =1a(2) =-2a(3) =0a(4) =-8a(5) =40a(6) =-384a(7) =4144a(8) =-54144a(9) =815616a(10) =-13958400a(11) =267218688a(12) =-5657444352a(13) =131222866944