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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 24 |
| 2 | 336 |
| 3 | 3984 |
| 4 | 54432 |
| 5 | 759744 |
| 6 | 10830144 |
| 7 | 156223392 |
| 8 | 2271228672 |
| 9 | 33183608352 |
| 10 | 486349645856 |
| 11 | 7142175976960 |
| 12 | 105014684996352 |
| 13 | 1545275154706944 |
| 14 | 22749491302298880 |
| 15 | 335018397934911744 |
| 16 | 4934548094852111360 |
[1,24,336,3984,54432,759744,10830144,156223392, 2271228672,33183608352,486349645856,7142175976960, 105014684996352,1545275154706944, 22749491302298880,335018397934911744, 4934548094852111360] |