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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 1548 |
| 3 | 20400912 |
| 4 | 2237404520000 |
| 5 | 1316258829530177400 |
| 6 | 3107531556500789042401392 |
| 7 | 23981023412887138890925360910336 |
| 8 | 519343443733819692494314622381817102336 |
| 9 | 28055691989665530513724742545624840551562500000 |
[0,2,1548,20400912,2237404520000, 1316258829530177400,3107531556500789042401392, 23981023412887138890925360910336, 519343443733819692494314622381817102336, 28055691989665530513724742545624840551562500000] |