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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 30 |
| 3 | 42 |
| 4 | 66 |
| 5 | 510 |
| 6 | 138 |
| 7 | 798 |
| 8 | 2730 |
| 9 | 870 |
| 10 | 282 |
| 11 | 330 |
| 12 | 354 |
| 13 | 1806 |
| 14 | 498 |
| 15 | 1590 |
[6,30,42,66,510,138,798,2730,870,282,330,354,1806, 498,1590] |