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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 24 |
| 4 | 48 |
| 5 | 480 |
| 6 | 960 |
| 7 | 13440 |
| 8 | 26880 |
| 9 | 161280 |
| 10 | 322560 |
| 11 | 7096320 |
| 12 | 14192640 |
| 13 | 369008640 |
| 14 | 738017280 |
| 15 | 295206912 |
| 16 | 590413824 |
| 17 | 20074070016 |
| 18 | 40148140032 |
| 19 | 1525629321216 |
| 20 | 15256293212160 |
| 21 | 30512586424320 |
| 22 | 61025172848640 |
| 23 | 2807157951037440 |
| 24 | 5614315902074880 |
[1,1,4,24,48,480,960,13440,26880,161280,322560, 7096320,14192640,369008640,738017280,295206912, 590413824,20074070016,40148140032,1525629321216, 15256293212160,30512586424320,61025172848640, 2807157951037440,5614315902074880] |