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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 60 |
| 6 | 432 |
| 7 | 3360 |
| 8 | 6912 |
| 9 | 86400 |
| 10 | 1080000 |
| 11 | 3432000 |
| 12 | 57542400 |
| 13 | 601810560 |
| 14 | 3374784000 |
| 15 | 71391196800 |
| 16 | 1506917744640 |
| 17 | 8134703216640 |
| 18 | 87731370397440 |
| 19 | 2330058011258880 |
| 20 | 15991083879321600 |
| 21 | 484342868413071360 |
[1,2,6,24,60,432,3360,6912,86400,1080000,3432000, 57542400,601810560,3374784000,71391196800, 1506917744640,8134703216640,87731370397440, 2330058011258880,15991083879321600, 484342868413071360] |