Period 7.

Terms

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