a(n) = 2*a(n-4) + a(n-8) for n >= 8.

Terms

a(0) =2a(1) =-1a(2) =2a(3) =1a(4) =1a(5) =3a(6) =3a(7) =5a(8) =4a(9) =5a(10) =8a(11) =11a(12) =9a(13) =13a(14) =19a(15) =27a(16) =22a(17) =31a(18) =46a(19) =65a(20) =53a(21) =75a(22) =111a(23) =157a(24) =128a(25) =181a(26) =268a(27) =379a(28) =309a(29) =437