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

Terms

a(0) =1a(1) =1a(2) =4a(3) =-3a(4) =-1a(5) =4a(6) =5a(7) =1a(8) =4a(9) =13a(10) =19a(11) =24a(12) =41a(13) =73a(14) =116a(15) =181a(16) =295a(17) =484a(18) =781a(19) =1257a(20) =2036a(21) =3301a(22) =5339a(23) =8632a(24) =13969a(25) =22609a(26) =36580a(27) =59181a(28) =95759a(29) =154948