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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 7 |
| 4 | 12 |
| 5 | 19 |
| 6 | 30 |
| 7 | 37 |
| 8 | 67 |
| 9 | 93 |
| 10 | 109 |
| 11 | 297 |
| 12 | 341 |
| 13 | 602 |
| 14 | 1377 |
| 15 | 1745 |
| 16 | 1972 |
| 17 | 4208 |
| 18 | 7942 |
| 19 | 9572 |
| 20 | 10409 |
| 21 | 11927 |
| 22 | 12707 |
| 23 | 13460 |
| 24 | 33803 |
[4,6,7,12,19,30,37,67,93,109,297,341,602,1377, 1745,1972,4208,7942,9572,10409,11927,12707,13460, 33803] |