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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 29 |
| 5 | 125 |
| 6 | 738 |
| 7 | 5053 |
| 8 | 40371 |
| 9 | 362926 |
| 10 | 3628985 |
| 11 | 39916889 |
| 12 | 479002546 |
| 13 | 6227021033 |
| 14 | 87178296643 |
| 15 | 1307674368880 |
| 16 | 20922789929421 |
| 17 | 355687428097597 |
| 18 | 6402373706095020 |
| 19 | 121645100408836181 |
| 20 | 2432902008180276155 |
[1,3,8,29,125,738,5053,40371,362926,3628985, 39916889,479002546,6227021033,87178296643, 1307674368880,20922789929421,355687428097597, 6402373706095020,121645100408836181, 2432902008180276155] |