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| n | a(n) |
|---|---|
| 2 | 6 |
| 3 | 229 |
| 4 | 12168 |
| 5 | 699310 |
| 6 | 42660740 |
| 7 | 2711857491 |
| 8 | 177709370440 |
| 9 | 11920293880380 |
| 10 | 814482988508400 |
| 11 | 56490879943263975 |
| 12 | 3966899457382283620 |
| 13 | 281477669727740682534 |
| 14 | 20150660162264704871708 |
| 15 | 1453641461401891280903545 |
| 16 | 105565083172095676962621280 |
[6,229,12168,699310,42660740,2711857491, 177709370440,11920293880380,814482988508400, 56490879943263975,3966899457382283620, 281477669727740682534,20150660162264704871708, 1453641461401891280903545, 105565083172095676962621280] |