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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 6 |
| 4 | 8 |
| 5 | 1 |
| 6 | 3 |
| 7 | 5 |
| 8 | 7 |
| 9 | 9 |
| 10 | 11 |
| 11 | 13 |
| 12 | 15 |
| 13 | 17 |
| 14 | 19 |
| 15 | 39 |
| 16 | 59 |
| 17 | 79 |
| 18 | 99 |
| 19 | 119 |
| 20 | 139 |
| 21 | 159 |
| 22 | 179 |
| 23 | 199 |
| 24 | 399 |
[2,4,6,8,1,3,5,7,9,11,13,15,17,19,39,59,79,99,119, 139,159,179,199,399] |