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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 15 |
| 3 | 491 |
| 4 | 25187 |
| 5 | 1725819 |
| 6 | 144558247 |
| 7 | 14029729645 |
| 8 | 1523926182363 |
| 9 | 180929760551225 |
| 10 | 23086562828397479 |
| 11 | 3126799551978895629 |
| 12 | 445266632168280620515 |
| 13 | 66178991463387525289801 |
| 14 | 10206120232877820185701707 |
| 15 | 1625518539321873371313790283 |
[1,1,15,491,25187,1725819,144558247,14029729645, 1523926182363,180929760551225,23086562828397479, 3126799551978895629,445266632168280620515, 66178991463387525289801, 10206120232877820185701707, 1625518539321873371313790283] |