Reciprocal of g.f. for A007863.

Terms

a(0) =1a(1) =-2a(2) =-3a(3) =-11a(4) =-49a(5) =-244a(6) =-1301a(7) =-7265a(8) =-41945a(9) =-248357a(10) =-1499838a(11) =-9202478a(12) =-57204263a(13) =-359491066a(14) =-2280171089a(15) =-14578108497a(16) =-93850280001a(17) =-607856133804