The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 24 |
| 6 | 56 |
| 7 | 120 |
| 8 | 720 |
| 9 | 1712 |
| 10 | 5040 |
| 11 | 9408 |
| 12 | 40320 |
| 13 | 92800 |
| 14 | 362880 |
| 15 | 3628800 |
| 16 | 4948992 |
| 17 | 7918592 |
| 18 | 39916800 |
| 19 | 479001600 |
| 20 | 984237056 |
| 21 | 6085088256 |
| 22 | 6227020800 |
| 23 | 63352393728 |
| 24 | 87178291200 |
| 25 | 168662855680 |
| 26 | 1307674368000 |
| 27 | 14782316470272 |
| 28 | 20922789888000 |
| 29 | 38238313152512 |
[1,2,4,6,24,56,120,720,1712,5040,9408,40320,92800, 362880,3628800,4948992,7918592,39916800,479001600, 984237056,6085088256,6227020800,63352393728, 87178291200,168662855680,1307674368000, 14782316470272,20922789888000,38238313152512] |