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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 16 |
| 7 | 208 |
| 8 | 2848 |
| 9 | 41216 |
| 10 | 624384 |
| 11 | 9812992 |
| 12 | 158883840 |
| 13 | 2636197888 |
| 14 | 44640468992 |
| 15 | 769058340864 |
| 16 | 13445805899776 |
| 17 | 238091742740480 |
| 18 | 4263121901322240 |
| 19 | 77082929745887232 |
| 20 | 1405899615605096448 |
| 21 | 25841135069123575808 |
| 22 | 478285335973855232000 |
| 23 | 8908149312942805876736 |
| 24 | 166863051347010382725120 |
[1,16,208,2848,41216,624384,9812992,158883840, 2636197888,44640468992,769058340864, 13445805899776,238091742740480,4263121901322240, 77082929745887232,1405899615605096448, 25841135069123575808,478285335973855232000, 8908149312942805876736,166863051347010382725120] |