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

Terms

a(0) =1a(1) =5a(2) =30a(3) =185a(4) =1145a(5) =7090a(6) =43905a(7) =271885a(8) =1683670a(9) =10426265a(10) =64565505a(11) =399827210a(12) =2475962945a(13) =15332604565a(14) =94948417230a(15) =587975897785