The OEIS is supported by the many generous donors to the OEIS Foundation.
A214688 as a simple table
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 24 |
| 4 | 408 |
| 5 | 9760 |
| 6 | 299520 |
| 7 | 11223744 |
| 8 | 496802432 |
| 9 | 25365482496 |
| 10 | 1467480983040 |
| 11 | 94873742909440 |
| 12 | 6778628603670528 |
| 13 | 530412734126346240 |
| 14 | 45110083291805622272 |
| 15 | 4143219058165730672640 |
| 16 | 408715543077297795072000 |
| 17 | 43097868598208296895512576 |
| 18 | 4837629293480336802779234304 |
[1,2,24,408,9760,299520,11223744,496802432, 25365482496,1467480983040,94873742909440, 6778628603670528,530412734126346240, 45110083291805622272,4143219058165730672640, 408715543077297795072000, 43097868598208296895512576, 4837629293480336802779234304] |