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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 286 |
| 3 | 7680 |
| 4 | 217350 |
| 5 | 6336512 |
| 6 | 188296108 |
| 7 | 5670567936 |
| 8 | 172459427910 |
| 9 | 5284842700800 |
| 10 | 162922160580036 |
| 11 | 5047099485847552 |
| 12 | 156983503897469340 |
| 13 | 4899363753956474880 |
| 14 | 153349672416272587800 |
| 15 | 4811846645261721927680 |
| 16 | 151316978279502571401798 |
| 17 | 4767566079229070105640960 |
[1,12,286,7680,217350,6336512,188296108, 5670567936,172459427910,5284842700800, 162922160580036,5047099485847552, 156983503897469340,4899363753956474880, 153349672416272587800,4811846645261721927680, 151316978279502571401798, 4767566079229070105640960] |