Trisection 1 of A199802.

Terms

a(0) =2a(1) =-1a(2) =-8a(3) =15a(4) =22a(5) =-104a(6) =17a(7) =510a(8) =-721a(9) =-1708a(10) =5806a(11) =1503a(12) =-31520a(13) =31519a(14) =121778a(15) =-312396a(16) =-233455a(17) =1885694a(18) =-1152593a(19) =-8196936a(20) =16079050a(21) =21867343a(22) =-109306936a(23) =24246207a(24) =528076766a(25) =-780482080a(26) =-1726348607a(27) =6132589566a(28) =1190594623a(29) =-32799408980