Berstel sequence: a(n+1) = 2*a(n) - 4*a(n-1) + 4*a(n-2).

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =0a(5) =-4a(6) =0a(7) =16a(8) =16a(9) =-32a(10) =-64a(11) =64a(12) =256a(13) =0a(14) =-768a(15) =-512a(16) =2048a(17) =3072a(18) =-4096a(19) =-12288a(20) =4096a(21) =40960a(22) =16384a(23) =-114688a(24) =-131072a(25) =262144a(26) =589824a(27) =-393216a(28) =-2097152a(29) =-262144