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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 31 |
| 5 | 33 |
| 6 | 76 |
| 7 | 196 |
| 8 | 319 |
| 9 | 405 |
| 10 | 591 |
| 11 | 2028 |
| 12 | 2140 |
| 13 | 4039 |
| 14 | 5745 |
| 15 | 16629 |
| 16 | 18061 |
| 17 | 20265 |
| 18 | 54129 |
| 19 | 119712 |
[1,3,4,31,33,76,196,319,405,591,2028,2140,4039, 5745,16629,18061,20265,54129,119712] |