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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 3240 |
| 7 | 45360 |
| 8 | 584640 |
| 9 | 13668480 |
| 10 | 322963200 |
| 11 | 7224940800 |
| 12 | 201040963200 |
| 13 | 6254004556800 |
| 14 | 197219089267200 |
| 15 | 6845849673062400 |
| 16 | 260976932536320000 |
| 17 | 10410615332941824000 |
| 18 | 441056225586706329600 |
| 19 | 20015606466369626112000 |
| 20 | 955852013167308601344000 |
| 21 | 47944066629381635801088000 |
[1,0,0,6,24,120,3240,45360,584640,13668480, 322963200,7224940800,201040963200,6254004556800, 197219089267200,6845849673062400, 260976932536320000,10410615332941824000, 441056225586706329600,20015606466369626112000, 955852013167308601344000, 47944066629381635801088000] |