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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 4 |
| 3 | 24 |
| 4 | 529 |
| 5 | 16100 |
| 6 | 919037 |
| 7 | 75568846 |
| 8 | 9196890092 |
| 9 | 1491628025318 |
| 10 | 317579623173729 |
| 11 | 86997150829931700 |
| 12 | 29703399282858184713 |
| 13 | 12512837775355494800500 |
| 14 | 6397110844644502402189404 |
| 15 | 3875565057688532269985283868 |
| 16 | 2747710211567246171588232074225 |
| 17 | 2265312860218073375019946448731300 |
[1,0,4,24,529,16100,919037,75568846,9196890092, 1491628025318,317579623173729,86997150829931700, 29703399282858184713,12512837775355494800500, 6397110844644502402189404, 3875565057688532269985283868, 2747710211567246171588232074225, 2265312860218073375019946448731300] |