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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 192 |
| 5 | 24 |
| 6 | 8160 |
| 7 | 2400 |
| 8 | 898560 |
| 9 | 384480 |
| 10 | 14400 |
| 11 | 245145600 |
| 12 | 126040320 |
| 13 | 9777600 |
| 14 | 50400 |
| 15 | 159035627520 |
| 16 | 90043269120 |
| 17 | 9660672000 |
| 18 | 179222400 |
| 19 | 80640 |
| 20 | 237882053283840 |
| 21 | 141969202744320 |
| 22 | 17961178152960 |
| 23 | 547498828800 |
| 24 | 2586608640 |
| 25 | 802369403419852800 |
[1,2,12,192,24,8160,2400,898560,384480,14400, 245145600,126040320,9777600,50400,159035627520, 90043269120,9660672000,179222400,80640, 237882053283840,141969202744320,17961178152960, 547498828800,2586608640,802369403419852800] |