a(n) = 2*Fibonacci(n) + 8*Fibonacci(n-5).

Terms

a(0) =10a(1) =24a(2) =34a(3) =58a(4) =92a(5) =150a(6) =242a(7) =392a(8) =634a(9) =1026a(10) =1660a(11) =2686a(12) =4346a(13) =7032a(14) =11378a(15) =18410a(16) =29788a(17) =48198a(18) =77986a(19) =126184a(20) =204170a(21) =330354a(22) =534524a(23) =864878a(24) =1399402a(25) =2264280a(26) =3663682a(27) =5927962a(28) =9591644a(29) =15519606