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| n | a(n) |
|---|---|
| 5 | 60 |
| 6 | 720 |
| 7 | 6090 |
| 8 | 47040 |
| 9 | 363384 |
| 10 | 2913120 |
| 11 | 24560910 |
| 12 | 218386080 |
| 13 | 2044958916 |
| 14 | 20112075984 |
| 15 | 207161237010 |
| 16 | 2228884869120 |
| 17 | 24989300398320 |
| 18 | 291322535242176 |
| 19 | 3524580157816854 |
| 20 | 44176838981652000 |
| 21 | 572725044049055100 |
| 22 | 7668896804089696560 |
| 23 | 105920137922879314650 |
| 24 | 1507138839384235136640 |
| 25 | 22068265782102952223400 |
| 26 | 332178010291171425732000 |
| 27 | 5135009134117954527323550 |
| 28 | 81449458937043220255508640 |
[60,720,6090,47040,363384,2913120,24560910, 218386080,2044958916,20112075984,207161237010, 2228884869120,24989300398320,291322535242176, 3524580157816854,44176838981652000, 572725044049055100,7668896804089696560, 105920137922879314650,1507138839384235136640, 22068265782102952223400,332178010291171425732000, 5135009134117954527323550, 81449458937043220255508640] |