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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 5040 |
| 8 | 40320 |
| 9 | 322560 |
| 10 | 2580480 |
| 11 | 18915120 |
| 12 | 129780720 |
| 13 | 851778120 |
| 14 | 5451917784 |
| 15 | 34566749214 |
| 16 | 219680806598 |
| 17 | 1411532175075 |
| 18 | 9225829672949 |
| 19 | 60933456588116 |
| 20 | 404658861693100 |
| 21 | 2692486238170128 |
| 22 | 17906521819159296 |
[1,2,6,24,120,720,5040,40320,322560,2580480, 18915120,129780720,851778120,5451917784, 34566749214,219680806598,1411532175075, 9225829672949,60933456588116,404658861693100, 2692486238170128,17906521819159296] |