a(n) = 2*a(n-1) - 2*a(n-2) with a(0)=1, a(1)=4.

Terms

a(0) =1a(1) =4a(2) =6a(3) =4a(4) =-4a(5) =-16a(6) =-24a(7) =-16a(8) =16a(9) =64a(10) =96a(11) =64a(12) =-64a(13) =-256a(14) =-384a(15) =-256a(16) =256a(17) =1024a(18) =1536a(19) =1024a(20) =-1024a(21) =-4096a(22) =-6144a(23) =-4096a(24) =4096a(25) =16384a(26) =24576a(27) =16384a(28) =-16384a(29) =-65536