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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 12 |
| 4 | 60 |
| 5 | 60 |
| 6 | 120 |
| 7 | 360 |
| 8 | 3960 |
| 9 | 27720 |
| 10 | 27720 |
| 11 | 27720 |
| 12 | 27720 |
| 13 | 27720 |
| 14 | 637560 |
| 15 | 8288280 |
| 16 | 240360120 |
| 17 | 240360120 |
| 18 | 240360120 |
| 19 | 240360120 |
| 20 | 240360120 |
| 21 | 240360120 |
| 22 | 9854764920 |
| 23 | 9854764920 |
| 24 | 19709529840 |
| 25 | 98547649200 |
| 26 | 1675310036400 |
| 27 | 88791431929200 |
[2,4,12,60,60,120,360,3960,27720,27720,27720, 27720,27720,637560,8288280,240360120,240360120, 240360120,240360120,240360120,240360120, 9854764920,9854764920,19709529840,98547649200, 1675310036400,88791431929200] |