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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 12 |
| 3 | 60 |
| 4 | 1260 |
| 5 | 13860 |
| 6 | 180180 |
| 7 | 277200 |
| 8 | 900900 |
| 9 | 3628800 |
| 10 | 15315300 |
| 11 | 28828800 |
| 12 | 38880000 |
| 13 | 290990700 |
| 14 | 373248000 |
| 15 | 428828400 |
| 16 | 2036934900 |
| 17 | 2477260800 |
| 18 | 3632428800 |
| 19 | 6692786100 |
| 20 | 8147739600 |
| 21 | 13335840000 |
| 22 | 15682867200 |
| 23 | 15925248000 |
| 24 | 20956320000 |
| 25 | 46849502700 |
| 26 | 61751289600 |
| 27 | 65181916800 |
| 28 | 68976230400 |
[1,12,60,1260,13860,180180,277200,900900,3628800, 15315300,28828800,38880000,290990700,373248000, 428828400,2036934900,2477260800,3632428800, 6692786100,8147739600,13335840000,15682867200, 15925248000,20956320000,46849502700,61751289600, 65181916800,68976230400] |