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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 31 |
| 5 | 150 |
| 6 | 515 |
| 7 | 13391 |
| 8 | 131964 |
| 9 | 664313 |
| 10 | 5392318 |
| 11 | 159468672 |
| 12 | 134453711 |
| 13 | 28728014494 |
| 14 | 50131235121 |
| 15 | 634347950217 |
| 16 | 48136136076258 |
| 17 | 1954623227727573 |
| 18 | 14433681032814706 |
| 19 | 76465679305346797 |
[1,3,6,31,150,515,13391,131964,664313,5392318, 159468672,134453711,28728014494,50131235121, 634347950217,48136136076258,1954623227727573, 14433681032814706,76465679305346797] |