a(n) = a(n-1) + a(n-3) + a(n-4), n >= 4, with initial terms 2,5,4,7.

Terms

a(0) =2a(1) =5a(2) =4a(3) =7a(4) =14a(5) =23a(6) =34a(7) =55a(8) =92a(9) =149a(10) =238a(11) =385a(12) =626a(13) =1013a(14) =1636a(15) =2647a(16) =4286a(17) =6935a(18) =11218a(19) =18151a(20) =29372a(21) =47525a(22) =76894a(23) =124417a(24) =201314a(25) =325733a(26) =527044a(27) =852775a(28) =1379822a(29) =2232599