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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 9 |
| 4 | 22 |
| 5 | 33 |
| 6 | 55 |
| 7 | 77 |
| 8 | 111 |
| 9 | 121 |
| 10 | 141 |
| 11 | 161 |
| 12 | 202 |
| 13 | 262 |
| 14 | 303 |
| 15 | 323 |
| 16 | 393 |
| 17 | 454 |
| 18 | 505 |
| 19 | 515 |
| 20 | 535 |
[4,6,9,22,33,55,77,111,121,141,161,202,262,303, 323,393,454,505,515,535] |