a(n) = 6*a(n-1)-8*a(n-2)+3 for n > 1; a(0) = 1, a(1) = 8.

Terms

a(0) =1a(1) =8a(2) =43a(3) =197a(4) =841a(5) =3473a(6) =14113a(7) =56897a(8) =228481a(9) =915713a(10) =3666433a(11) =14672897a(12) =58705921a(13) =234852353a(14) =939466753a(15) =3757981697a(16) =15032156161a(17) =60129083393a(18) =240517251073a(19) =962070839297