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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 12 |
| 2 | 310 |
| 3 | 15960 |
| 4 | 1517098 |
| 5 | 224269540 |
| 6 | 48197922526 |
| 7 | 14130438821296 |
| 8 | 5428021401209682 |
| 9 | 2643726413982309052 |
| 10 | 1592189299187949292422 |
| 11 | 1161629303960888128771592 |
| 12 | 1009558061720938140021739386 |
[2,12,310,15960,1517098,224269540,48197922526, 14130438821296,5428021401209682, 2643726413982309052,1592189299187949292422, 1161629303960888128771592, 1009558061720938140021739386] |