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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 48 |
| 4 | 96 |
| 5 | 960 |
| 6 | 1280 |
| 7 | 17920 |
| 8 | 17920 |
| 9 | 322560 |
| 10 | 258048 |
| 11 | 5677056 |
| 12 | 3784704 |
| 13 | 98402304 |
| 14 | 56229888 |
| 15 | 1686896640 |
| 16 | 843448320 |
| 17 | 28677242880 |
| 18 | 12745441280 |
| 19 | 484326768640 |
| 20 | 193730707456 |
| 21 | 8136689713152 |
| 22 | 2958796259328 |
| 23 | 136104627929088 |
| 24 | 45368209309696 |
| 25 | 2268410465484800 |
[1,2,8,48,96,960,1280,17920,17920,322560,258048, 5677056,3784704,98402304,56229888,1686896640, 843448320,28677242880,12745441280,484326768640, 193730707456,8136689713152,2958796259328, 136104627929088,45368209309696,2268410465484800] |