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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 63 |
| 4 | 1162 |
| 5 | 31263 |
| 6 | 1207344 |
| 7 | 61719326 |
| 8 | 4103067834 |
| 9 | 341454828363 |
| 10 | 34946904263560 |
| 11 | 4304483416099530 |
| 12 | 629558493157805370 |
| 13 | 107728435291299602135 |
| 14 | 21346960361800584031800 |
| 15 | 4847223770735591212039818 |
| 16 | 1250978551922243595690043914 |
| 17 | 364052135715732457875255719691 |
[1,1,6,63,1162,31263,1207344,61719326,4103067834, 341454828363,34946904263560,4304483416099530, 629558493157805370,107728435291299602135, 21346960361800584031800,4847223770735591212039818, 1250978551922243595690043914, 364052135715732457875255719691] |