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| n | a(n) |
|---|---|
| 4 | 24 |
| 5 | 300 |
| 6 | 3360 |
| 7 | 38850 |
| 8 | 475776 |
| 9 | 6231960 |
| 10 | 87530400 |
| 11 | 1316954430 |
| 12 | 21173760960 |
| 13 | 362670636900 |
| 14 | 6596214691248 |
| 15 | 126980000240730 |
| 16 | 2579214238608000 |
| 17 | 55118036257959600 |
| 18 | 1235935135837111104 |
| 19 | 29009023670878484598 |
[24,300,3360,38850,475776,6231960,87530400, 1316954430,21173760960,362670636900,6596214691248, 126980000240730,2579214238608000, 55118036257959600,1235935135837111104, 29009023670878484598] |