a(n) = 9 - (floor(n*Pi) mod 9).

Terms

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