a(0)=1, a(1)=6, a(n) = 7*a(n-1) - 2*a(n-2).

Terms

a(0) =1a(1) =6a(2) =40a(3) =268a(4) =1796a(5) =12036a(6) =80660a(7) =540548a(8) =3622516a(9) =24276516a(10) =162690580a(11) =1090281028a(12) =7306586036a(13) =48965540196a(14) =328145609300