a(n) = (2^(2*n)+n) mod (2*n).

Terms

a(0) =1a(1) =2a(2) =1a(3) =4a(4) =9a(5) =10a(6) =11a(7) =8a(8) =1a(9) =6a(10) =15a(11) =4a(12) =17a(13) =2a(14) =19a(15) =16a(16) =21a(17) =10a(18) =23a(19) =36a(20) =1a(21) =38a(22) =27a(23) =40a(24) =49a(25) =42a(26) =1a(27) =4a(28) =33a(29) =46