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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 15 |
| 3 | 816 |
| 4 | 316251 |
| 5 | 873642672 |
| 6 | 17743125256857 |
| 7 | 2739097835911193328 |
| 8 | 3301626910467952067341626 |
| 9 | 31698997711344336177849363574320 |
| 10 | 2460103385023594223069956382123378560008 |
[1,2,15,816,316251,873642672,17743125256857, 2739097835911193328,3301626910467952067341626, 31698997711344336177849363574320, 2460103385023594223069956382123378560008] |