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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 31 |
| 6 | 187 |
| 7 | 2283 |
| 8 | 42743 |
| 9 | 1641965 |
| 10 | 103253028 |
| 11 | 12810578372 |
| 12 | 2750743641417 |
| 13 | 1126452639815250 |
| 14 | 830354090187673737 |
| 15 | 1152099822267599547753 |
[1,2,3,8,31,187,2283,42743,1641965,103253028, 12810578372,2750743641417,1126452639815250, 830354090187673737,1152099822267599547753] |