a(n+1) = sum of digits of (a(n) + a(n-1)).

Terms

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