a(-1) = 1 and g.f. A(x) satisfies A(x) - 1/A(x) = 1/x - 1.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =1a(4) =0a(5) =-2a(6) =-3a(7) =1a(8) =11a(9) =15a(10) =-13a(11) =-77a(12) =-86a(13) =144a(14) =595a(15) =495a(16) =-1520a(17) =-4810a(18) =-2485a(19) =15675a(20) =39560a(21) =6290a(22) =-159105a(23) =-324805a(24) =87075a(25) =1592843a(26) =2616757a(27) =-2136539a(28) =-15726114a(29) =-20247800