a(n) = 4^(n-1)*Fibonacci(n).

Terms

a(0) =0a(1) =1a(2) =4a(3) =32a(4) =192a(5) =1280a(6) =8192a(7) =53248a(8) =344064a(9) =2228224a(10) =14417920a(11) =93323264a(12) =603979776a(13) =3909091328a(14) =25300041728a(15) =163745628160