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

Terms

a(0) =0a(1) =1a(2) =2a(3) =8a(4) =32a(5) =184a(6) =1104a(7) =8448a(8) =67584a(9) =648576a(10) =6485760a(11) =74972160a(12) =899665920a(13) =12174658560a(14) =170445219840