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

Terms

a(0) =1a(1) =2a(2) =10a(3) =68a(4) =484a(5) =3464a(6) =24808a(7) =177680a(8) =1272592a(9) =9114656a(10) =65281696a(11) =467565632a(12) =3348834880a(13) =23985285248a(14) =171789272704