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| n | a(n) |
|---|---|
| 1 | 120 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 1 |
| 10 | 1 |
| 11 | 1 |
| 12 | 15 |
| 13 | 192 |
| 14 | 3064 |
| 15 | 47143 |
| 16 | 596666 |
| 17 | 6335112 |
| 18 | 57993446 |
| 19 | 465509399 |
| 20 | 3352084272 |
| 21 | 21950707367 |
| 22 | 132484328850 |
[120,1,1,1,1,1,1,1,1,1,1,15,192,3064,47143,596666, 6335112,57993446,465509399,3352084272,21950707367, 132484328850] |