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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 204 |
| 3 | 3978 |
| 4 | 83538 |
| 5 | 1837836 |
| 6 | 41745132 |
| 7 | 970574319 |
| 8 | 22970258883 |
| 9 | 551286213192 |
| 10 | 13381219902024 |
| 11 | 327839887599588 |
| 12 | 8095123378420596 |
| 13 | 201221638263597672 |
| 14 | 5030540956589941800 |
| 15 | 126392341534322287725 |
[1,12,204,3978,83538,1837836,41745132,970574319, 22970258883,551286213192,13381219902024, 327839887599588,8095123378420596, 201221638263597672,5030540956589941800, 126392341534322287725] |