a(n) = (1/2+1/2*i*sqrt(11))^n + (1/2-1/2*i*sqrt(11))^n, where i=sqrt(-1).

Terms

a(0) =1a(1) =-5a(2) =-8a(3) =7a(4) =31a(5) =10a(6) =-83a(7) =-113a(8) =136a(9) =475a(10) =67a(11) =-1358a(12) =-1559a(13) =2515a(14) =7192a(15) =-353a(16) =-21929a(17) =-20870a(18) =44917a(19) =107527a(20) =-27224a(21) =-349805a(22) =-268133a(23) =781282a(24) =1585681a(25) =-758165a(26) =-5515208a(27) =-3240713a(28) =13304911a(29) =23027050