a(n)=5*a(n-1)+7*a(n-2), n>1 ; a(0)=1, a(1)=7 .

Terms

a(0) =1a(1) =7a(2) =42a(3) =259a(4) =1589a(5) =9758a(6) =59913a(7) =367871a(8) =2258746a(9) =13868827a(10) =85155357a(11) =522858574a(12) =3210380369a(13) =19711911863a(14) =121032221898a(15) =743144492531