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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 24 |
| 2 | 1440 |
| 3 | 97440 |
| 4 | 6745200 |
| 5 | 467170704 |
| 6 | 32179283136 |
| 7 | 2201392866816 |
| 8 | 149582010088368 |
| 9 | 10100991172786800 |
| 10 | 678330750569025840 |
| 11 | 45330886561301259360 |
| 12 | 3016323760677017743680 |
| 13 | 199948320909528951802560 |
| 14 | 13210188418741950461761920 |
| 15 | 870202858863529042485373440 |
[1,24,1440,97440,6745200,467170704,32179283136, 2201392866816,149582010088368,10100991172786800, 678330750569025840,45330886561301259360, 3016323760677017743680,199948320909528951802560, 13210188418741950461761920, 870202858863529042485373440] |