Trisection 2 of A199802.

Terms

a(0) =2a(1) =-4a(2) =-5a(3) =27a(4) =-8a(5) =-128a(6) =200a(7) =405a(8) =-1525a(9) =-172a(10) =8002a(11) =-9072a(12) =-29585a(13) =83119a(14) =47732a(15) =-483840a(16) =357884a(17) =2025929a(18) =-4346921a(19) =-4941000a(20) =28343650a(21) =-10011500a(22) =-132300829a(23) =215642979a(24) =407506016a(25) =-1608010240a(26) =-81576032a(27) =8313490269a(28) =-9921126365a(29) =-30119890772