a(n) = 5*a(n-1)+a(n-2)-2*a(n-3).

Terms

a(0) =0a(1) =2a(2) =11a(3) =57a(4) =292a(5) =1495a(6) =7653a(7) =39176a(8) =200543a(9) =1026585a(10) =5255116a(11) =26901079a(12) =137707341a(13) =704927552a(14) =3608542943a(15) =18472227585a(16) =94559825764a(17) =484054270519