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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 19 |
| 2 | 532 |
| 3 | 19684 |
| 4 | 905464 |
| 5 | 49800520 |
| 6 | 3187233280 |
| 7 | 232668029440 |
| 8 | 19078778414080 |
| 9 | 1736168835681280 |
| 10 | 173616883568128000 |
| 11 | 18924240308925952000 |
| 12 | 2233060356453262336000 |
| 13 | 283598665269564316672000 |
[1,19,532,19684,905464,49800520,3187233280, 232668029440,19078778414080,1736168835681280, 173616883568128000,18924240308925952000, 2233060356453262336000,283598665269564316672000] |