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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 5040 |
| 8 | 36672 |
| 9 | 294384 |
| 10 | 2571360 |
| 11 | 24498656 |
| 12 | 258136960 |
| 13 | 2805110428 |
| 14 | 33942718440 |
| 15 | 446246467932 |
| 16 | 6175857338372 |
[1,2,6,24,120,720,5040,36672,294384,2571360, 24498656,258136960,2805110428,33942718440, 446246467932,6175857338372] |