a(n) = a(n-1) + a(n-3) + a(n-4), where a(0) = 4, a(1) = 3, a(2) = 2, a(3) = 1.

Terms

a(0) =4a(1) =3a(2) =2a(3) =1a(4) =8a(5) =13a(6) =16a(7) =25a(8) =46a(9) =75a(10) =116a(11) =187a(12) =308a(13) =499a(14) =802a(15) =1297a(16) =2104a(17) =3405a(18) =5504a(19) =8905a(20) =14414a(21) =23323a(22) =37732a(23) =61051a(24) =98788a(25) =159843a(26) =258626a(27) =418465a(28) =677096a(29) =1095565