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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 5040 |
| 8 | 40320 |
| 9 | 362880 |
| 10 | 3628799 |
| 11 | 39916779 |
| 12 | 479001228 |
| 13 | 6227014404 |
| 14 | 87178179816 |
| 15 | 1307672369640 |
| 16 | 20922752672640 |
| 17 | 355686706327680 |
| 18 | 6402359109968640 |
| 19 | 121644792614741760 |
| 20 | 2432895242801771955 |
| 21 | 51090787299486057355 |
| 22 | 1123997039003038423610 |
[1,1,2,6,24,120,720,5040,40320,362880,3628799, 39916779,479001228,6227014404,87178179816, 1307672369640,20922752672640,355686706327680, 6402359109968640,121644792614741760, 2432895242801771955,51090787299486057355, 1123997039003038423610] |