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

Terms

a(0) =-1a(1) =3a(2) =2a(3) =1a(4) =3a(5) =8a(6) =11a(7) =15a(8) =26a(9) =45a(10) =71a(11) =112a(12) =183a(13) =299a(14) =482a(15) =777a(16) =1259a(17) =2040a(18) =3299a(19) =5335a(20) =8634a(21) =13973a(22) =22607a(23) =36576a(24) =59183a(25) =95763a(26) =154946a(27) =250705a(28) =405651a(29) =656360