Sum of digits of n^2.

Terms

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