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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 18 |
| 3 | 246 |
| 4 | 5808 |
| 5 | 316800 |
| 6 | 33994188 |
| 7 | 8119777890 |
| 8 | 3947661560964 |
| 9 | 4209693243140760 |
| 10 | 9272914213858594488 |
| 11 | 44451105435218301006576 |
| 12 | 443715189648501201190713852 |
| 13 | 9592990624095118315413686008902 |
| 14 | 434027944128749167232792242832245920 |
[3,18,246,5808,316800,33994188,8119777890, 3947661560964,4209693243140760, 9272914213858594488,44451105435218301006576, 443715189648501201190713852, 9592990624095118315413686008902, 434027944128749167232792242832245920] |