a(n+1) = 3*a(n-2) + 2*a(n-1), a(n)=x^n+y^n+z^n.

Terms

a(0) =3a(1) =0a(2) =4a(3) =9a(4) =8a(5) =30a(6) =43a(7) =84a(8) =176a(9) =297a(10) =604a(11) =1122a(12) =2099a(13) =4056a(14) =7564a(15) =14409a(16) =27296a(17) =51510a(18) =97819a(19) =184908a(20) =350168a(21) =663273a(22) =1255060a(23) =2377050a(24) =4499939a(25) =8519280a(26) =16131028a(27) =30538377a(28) =57819896a(29) =109469838