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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 36 |
| 4 | 448 |
| 5 | 6875 |
| 6 | 124956 |
| 7 | 2624293 |
| 8 | 62537728 |
| 9 | 1667191653 |
| 10 | 49158400000 |
| 11 | 1588285928306 |
| 12 | 55796298391296 |
| 13 | 2117279603738494 |
| 14 | 86299754734693696 |
| 15 | 3760031421065559375 |
| 16 | 174374733095888748544 |
| 17 | 8575617145497637681301 |
| 18 | 445758339115421869936896 |
| 19 | 24417549315693295193935516 |
[1,1,4,36,448,6875,124956,2624293,62537728, 1667191653,49158400000,1588285928306, 55796298391296,2117279603738494,86299754734693696, 3760031421065559375,174374733095888748544, 8575617145497637681301,445758339115421869936896, 24417549315693295193935516] |