a(n)=3a(n-1)-4a(n-2)+2a(n-3)-a(n-4), a(0)=a(1)=a(2)=0, a(3)=1, a(4)=3.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =3a(5) =5a(6) =5a(7) =0a(8) =-13a(9) =-34a(10) =-55a(11) =-55a(12) =0a(13) =144a(14) =377a(15) =610a(16) =610a(17) =0a(18) =-1597a(19) =-4181a(20) =-6765a(21) =-6765a(22) =0a(23) =17711a(24) =46368a(25) =75025a(26) =75025a(27) =0a(28) =-196418a(29) =-514229