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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 2 |
| 3 | 36 |
| 4 | 30 |
| 5 | 6 |
| 6 | 2925 |
| 7 | 2448 |
| 8 | 660 |
| 9 | 56 |
| 10 | 1663740 |
| 11 | 1265004 |
| 12 | 353430 |
| 13 | 42504 |
| 14 | 1820 |
| 15 | 6774333588 |
| 16 | 4368213360 |
| 17 | 1114691760 |
| 18 | 139915440 |
| 19 | 8561520 |
| 20 | 201376 |
| 21 | 204208594169580 |
| 22 | 106458751541142 |
| 23 | 23004238451040 |
| 24 | 2630276490960 |
[1,3,2,36,30,6,2925,2448,660,56,1663740,1265004, 353430,42504,1820,6774333588,4368213360, 1114691760,139915440,8561520,201376, 204208594169580,106458751541142,23004238451040, 2630276490960] |