| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 24 |
| 2 | 336 |
| 3 | 3584 |
| 4 | 32256 |
| 5 | 258048 |
| 6 | 1892352 |
| 7 | 12976128 |
| 8 | 84344832 |
| 9 | 524812288 |
| 10 | 3148873728 |
| 11 | 18320719872 |
| 12 | 103817412608 |
| 13 | 574988746752 |
| 14 | 3121367482368 |
| 15 | 16647293239296 |
| 16 | 87398289506304 |
| 17 | 452414675091456 |
| 18 | 2312341672689664 |
| 19 | 11683410556747776 |
| 20 | 58417052783738880 |
| 21 | 289303499500421120 |
[1,24,336,3584,32256,258048,1892352,12976128, 84344832,524812288,3148873728,18320719872, 103817412608,574988746752,3121367482368, 16647293239296,87398289506304,452414675091456, 2312341672689664,11683410556747776, 58417052783738880,289303499500421120] |