G.f. satisfies A(x) = 1 + x*A(x) / (1 + x*A(x)^5).

Terms

a(0) =1a(1) =1a(2) =0a(3) =-5a(4) =-10a(5) =40a(6) =245a(7) =-26a(8) =-4375a(9) =-11410a(10) =53040a(11) =377850a(12) =-12320a(13) =-7988194a(14) =-23011625a(15) =106662595a(16) =824671575a(17) =64095550a(18) =-18490968680a(19) =-57052839001a(20) =254513058375a(22) =419490572800