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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 30 |
| 4 | 6 |
| 5 | 210 |
| 6 | 6 |
| 7 | 2310 |
| 8 | 2730 |
| 9 | 30 |
| 10 | 39270 |
| 11 | 7410 |
| 12 | 42 |
| 13 | 7590 |
| 14 | 46410 |
| 15 | 1272810 |
| 16 | 30 |
| 17 | 930930 |
| 18 | 82110 |
| 19 | 6 |
| 20 | 21111090 |
| 21 | 1230 |
| 22 | 48969690 |
[1,2,6,30,6,210,6,2310,2730,30,39270,7410,42,7590, 46410,1272810,30,930930,82110,6,21111090,1230, 48969690] |