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| n | a(n) |
|---|---|
| 2 | 6 |
| 3 | 66 |
| 4 | 630 |
| 5 | 7140 |
| 6 | 103740 |
| 7 | 1272810 |
| 8 | 56812470 |
| 9 | 1722580860 |
| 10 | 48098217090 |
| 11 | 1850186768430 |
| 12 | 139261952960130 |
| 13 | 17743036637876550 |
| 14 | 741902728913225880 |
| 15 | 21549201398378163510 |
| 16 | 2378522762792139793830 |
| 17 | 351206814022419685159830 |
[6,66,630,7140,103740,1272810,56812470,1722580860, 48098217090,1850186768430,139261952960130, 17743036637876550,741902728913225880, 21549201398378163510,2378522762792139793830, 351206814022419685159830] |