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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 162 |
| 5 | 16410 |
| 6 | 1839645 |
| 7 | 210928977 |
| 8 | 17676193171 |
| 9 | 1148671947972 |
| 10 | 71262995700540 |
| 11 | 4352863891098140 |
| 12 | 258238261126722129 |
| 13 | 14806140740844716211 |
| 14 | 815211282605034375060 |
| 15 | 42951699550186642926270 |
| 16 | 2166061193994862365099390 |
[1,3,162,16410,1839645,210928977,17676193171, 1148671947972,71262995700540,4352863891098140, 258238261126722129,14806140740844716211, 815211282605034375060,42951699550186642926270, 2166061193994862365099390] |