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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 129 |
| 4 | 3188 |
| 5 | 106820 |
| 6 | 4530174 |
| 7 | 232744274 |
| 8 | 14054237000 |
| 9 | 975665799792 |
| 10 | 76568358325440 |
| 11 | 6703512043934112 |
| 12 | 647772783078516600 |
| 13 | 68484470168404178928 |
| 14 | 7863452609057425825704 |
| 15 | 974474039841523412062440 |
| 16 | 129636661193226128284609344 |
| 17 | 18427094124309886080021680640 |
[1,1,8,129,3188,106820,4530174,232744274, 14054237000,975665799792,76568358325440, 6703512043934112,647772783078516600, 68484470168404178928,7863452609057425825704, 974474039841523412062440, 129636661193226128284609344, 18427094124309886080021680640] |