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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 12 |
| 2 | 358 |
| 3 | 19992 |
| 4 | 1791882 |
| 5 | 235396260 |
| 6 | 42624803310 |
| 7 | 10177141489200 |
| 8 | 3098164254001170 |
| 9 | 1171315364214109500 |
| 10 | 538446859100064311670 |
| 11 | 295771765211446451586120 |
| 12 | 191335531681410403898936730 |
[2,12,358,19992,1791882,235396260,42624803310, 10177141489200,3098164254001170, 1171315364214109500,538446859100064311670, 295771765211446451586120, 191335531681410403898936730] |