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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 7 |
| 4 | 8 |
| 5 | 10 |
| 6 | 20 |
| 7 | 21 |
| 8 | 26 |
| 9 | 101 |
| 10 | 119 |
| 11 | 172 |
| 12 | 409 |
| 13 | 621 |
| 14 | 1043 |
| 15 | 1204 |
| 16 | 1283 |
| 17 | 1673 |
| 18 | 2003 |
| 19 | 4336 |
| 20 | 5773 |
| 21 | 12913 |
| 22 | 13517 |
[4,6,7,8,10,20,21,26,101,119,172,409,621,1043, 1204,1283,1673,2003,4336,5773,12913,13517] |