Convolution of Fibonacci numbers and positive integers repeated three times (A000045 and A008620).

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =7a(5) =12a(6) =22a(7) =34a(8) =56a(9) =94a(10) =150a(11) =244a(12) =399a(13) =643a(14) =1042a(15) =1691a(16) =2733a(17) =4424a(18) =7164a(19) =11588a(20) =18752a(21) =30348a(22) =49100a(23) =79448a(24) =128557a(25) =208005a(26) =336562a(27) =544577a(28) =881139a(29) =1425716