Expansion of x/B(x) where B(x) is the g.f. for A002487.

Terms

a(0) =1a(1) =-1a(2) =-1a(3) =2a(4) =-2a(5) =0a(6) =4a(7) =-4a(8) =-2a(9) =6a(10) =-4a(11) =-2a(12) =10a(13) =-8a(14) =-6a(15) =14a(16) =-10a(17) =-4a(18) =20a(19) =-16a(20) =-8a(21) =24a(22) =-18a(23) =-6a(24) =34a(25) =-28a(26) =-14a(27) =42a(28) =-34a(29) =-8