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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 72 |
| 3 | 1736 |
| 4 | 53040 |
| 5 | 1961728 |
| 6 | 85062432 |
| 7 | 4225904800 |
| 8 | 236455369344 |
| 9 | 14705880874944 |
| 10 | 1005982098054912 |
| 11 | 75048224139686912 |
| 12 | 6062679436944758784 |
| 13 | 527187725605767366144 |
| 14 | 49092882744958427976192 |
| 15 | 4874131922792403196021248 |
| 16 | 513942386047796079510884352 |
| 17 | 57356122407632751143615036416 |
| 18 | 6754087907265415509369502427136 |
| 19 | 836924235604443592471459956156416 |
[4,72,1736,53040,1961728,85062432,4225904800, 236455369344,14705880874944,1005982098054912, 75048224139686912,6062679436944758784, 527187725605767366144,49092882744958427976192, 4874131922792403196021248, 513942386047796079510884352, 57356122407632751143615036416, 6754087907265415509369502427136, 836924235604443592471459956156416] |