Trisection 1 of A199803.

Terms

a(0) =-1a(1) =2a(2) =4a(3) =-15a(4) =-2a(5) =79a(6) =-88a(7) =-294a(8) =815a(9) =488a(10) =-4769a(11) =3438a(12) =20080a(13) =-42527a(14) =-49666a(15) =278943a(16) =-93220a(17) =-1308634a(18) =2103343a(19) =4067664a(20) =-15799793a(21) =-1126550a(22) =82089836a(23) =-96324543a(24) =-299451394a(25) =864290495a(26) =454552096a(27) =-4979131422a(28) =3870112831a(29) =20615805880