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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 2 |
| 3 | 5514234 |
| 4 | 2883040542828 |
| 5 | 40804091270010980 |
| 6 | 60520556880158419470 |
| 7 | 21901769993996949991662 |
| 8 | 3041658168762971457654584 |
| 9 | 211558602330274827202235208 |
| 10 | 8728129703136293355833601210 |
| 11 | 239394223814453881755898003490 |
| 12 | 4731013227415233819791988908772 |
[0,0,2,5514234,2883040542828,40804091270010980, 60520556880158419470,21901769993996949991662, 3041658168762971457654584, 211558602330274827202235208, 8728129703136293355833601210, 239394223814453881755898003490, 4731013227415233819791988908772] |