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| n | a(n) |
|---|---|
| 5 | 12 |
| 6 | 900 |
| 7 | 25200 |
| 8 | 442680 |
| 9 | 5846400 |
| 10 | 64420272 |
| 11 | 622175400 |
| 12 | 5466166200 |
| 13 | 44611306740 |
| 14 | 343916472900 |
| 15 | 2531921456064 |
| 16 | 17956666859040 |
| 17 | 123458676825120 |
| 18 | 827056125453600 |
| 19 | 5419508203393200 |
| 20 | 34847210197637424 |
| 21 | 220424306985639540 |
| 22 | 1374479672119161300 |
| 23 | 8463477229726134000 |
| 24 | 51536194734146965920 |
| 25 | 310706598354410079360 |
[12,900,25200,442680,5846400,64420272,622175400, 5466166200,44611306740,343916472900,2531921456064, 17956666859040,123458676825120,827056125453600, 5419508203393200,34847210197637424, 220424306985639540,1374479672119161300, 8463477229726134000,51536194734146965920, 310706598354410079360] |