a(n) = 5*a(n-1) + 4*a(n-2) with a(1)=5, a(2)=4.

Terms

a(0) =5a(1) =4a(2) =40a(3) =216a(4) =1240a(5) =7064a(6) =40280a(7) =229656a(8) =1309400a(9) =7465624a(10) =42565720a(11) =242691096a(12) =1383718360a(13) =7889356184a(14) =44981654360a(15) =256465696536