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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 41 |
| 5 | 207 |
| 6 | 1247 |
| 7 | 8735 |
| 8 | 69884 |
| 9 | 628962 |
| 10 | 6289628 |
| 11 | 69185914 |
| 12 | 830230968 |
| 13 | 10793002593 |
| 14 | 151102036314 |
| 15 | 2266530544723 |
| 16 | 36264488715581 |
| 17 | 616496308164884 |
| 18 | 11096933546967914 |
| 19 | 210841737392390378 |
| 20 | 4216834747847807562 |
[1,3,10,41,207,1247,8735,69884,628962,6289628, 69185914,830230968,10793002593,151102036314, 2266530544723,36264488715581,616496308164884, 11096933546967914,210841737392390378, 4216834747847807562] |