Trisection 0 of A199803.

Terms

a(0) =1a(1) =-2a(2) =-1a(3) =12a(4) =-10a(5) =-49a(6) =112a(7) =111a(8) =-710a(9) =316a(10) =3233a(11) =-5634a(12) =-9505a(13) =40592a(14) =-1934a(15) =-204897a(16) =264664a(17) =717295a(18) =-2243578a(19) =-873336a(20) =12543857a(21) =-11138050a(22) =-50210993a(23) =119318436a(24) =108054622a(25) =-743719745a(26) =372976064a(27) =3334358847a(28) =-6051013534a(29) =-9504084892