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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 18 |
| 3 | 24 |
| 4 | 27216 |
| 5 | 5878656 |
| 6 | 105815808 |
| 7 | 346652587008 |
| 8 | 693305174016 |
| 9 | 299507835174912 |
| 10 | 102431679629819904 |
| 11 | 75255927891296256 |
| 12 | 451535567347777536 |
| 13 | 422637291037519773696 |
| 14 | 479270688036547423371264 |
[1,1,18,24,27216,5878656,105815808,346652587008, 693305174016,299507835174912,102431679629819904, 75255927891296256,451535567347777536, 422637291037519773696,479270688036547423371264] |