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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 202 |
| 4 | 7745 |
| 5 | 429192 |
| 6 | 31383169 |
| 7 | 2862173104 |
| 8 | 313456891041 |
| 9 | 40120056928000 |
| 10 | 5880757402778489 |
| 11 | 971776774765633536 |
| 12 | 178783183332534538849 |
| 13 | 36248462186643418851328 |
| 14 | 8031317081954231731640625 |
| 15 | 1930762515644331053063077888 |
| 16 | 500587184017640118192794723009 |
| 17 | 139240118930461640299714951839744 |
[1,1,9,202,7745,429192,31383169,2862173104, 313456891041,40120056928000,5880757402778489, 971776774765633536,178783183332534538849, 36248462186643418851328,8031317081954231731640625, 1930762515644331053063077888, 500587184017640118192794723009, 139240118930461640299714951839744] |