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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 14 |
| 5 | 18 |
| 6 | 23 |
| 7 | 62 |
| 8 | 95 |
| 9 | 423 |
| 10 | 5339 |
| 11 | 12352 |
| 12 | 108359 |
| 13 | 129805 |
| 14 | 5334194 |
| 15 | 82007322 |
| 16 | 90401717 |
| 17 | 199671691 |
| 18 | 434184265 |
| 19 | 655956850 |
| 20 | 44438886071 |
[1,3,4,14,18,23,62,95,423,5339,12352,108359, 129805,5334194,82007322,90401717,199671691, 434184265,655956850,44438886071] |