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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 5 |
| 3 | 6 |
| 4 | 7 |
| 5 | 8 |
| 6 | 10 |
| 7 | 15 |
| 8 | 18 |
| 9 | 23 |
| 10 | 157 |
| 11 | 165 |
| 12 | 183 |
| 13 | 184 |
| 14 | 362 |
| 15 | 611 |
| 16 | 908 |
| 17 | 2940 |
| 18 | 6875 |
| 19 | 9446 |
| 20 | 16041 |
[4,5,6,7,8,10,15,18,23,157,165,183,184,362,611, 908,2940,6875,9446,16041] |