a(1) = 1, a(2) = a(3) = a(4) = 0; a(n) = a(n-4) + a(n-3) for n > 4.

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =0a(6) =0a(7) =1a(8) =1a(9) =0a(10) =1a(11) =2a(12) =1a(13) =1a(14) =3a(15) =3a(16) =2a(17) =4a(18) =6a(19) =5a(20) =6a(21) =10a(22) =11a(23) =11a(24) =16a(25) =21a(26) =22a(27) =27a(28) =37a(29) =43