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

Terms

a(0) =2a(1) =5a(2) =27a(3) =140a(4) =727a(5) =3775a(6) =19602a(7) =101785a(8) =528527a(9) =2744420a(10) =14250627a(11) =73997555a(12) =384238402a(13) =1995189565a(14) =10360186227a(15) =53796120700a(16) =279340789727