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| n | a(n) |
|---|---|
| 1 | 18 |
| 2 | 60 |
| 3 | 900 |
| 4 | 360 |
| 5 | 1800 |
| 6 | 3360 |
| 7 | 14400 |
| 8 | 5040 |
| 9 | 44100 |
| 10 | 15120 |
| 11 | 508032 |
| 12 | 27720 |
| 13 | 396900 |
| 14 | 98280 |
[18,60,900,360,1800,3360,14400,5040,44100,15120, 508032,27720,396900,98280] |