G.f. satisfies A(x) = (1 + x*A(x)) * (1 - x*A(x)^2).

Terms

a(0) =1a(1) =0a(2) =-1a(3) =1a(4) =2a(5) =-6a(6) =-1a(7) =28a(8) =-31a(9) =-98a(10) =288a(11) =131a(12) =-1730a(13) =1638a(14) =7431a(15) =-19583a(16) =-15502a(17) =135642a(18) =-99523a(19) =-664050a(20) =1535896a(21) =1816196a(22) =-11902728a(23) =5944326a(24) =64487669a(25) =-129346490a(26) =-213116764a(27) =1112382523a(28) =-277762230a(29) =-6572175490