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| n | a(n) |
|---|---|
| 1 | 240 |
| 2 | 105856 |
| 3 | 342943680 |
| 4 | 8159542628448 |
| 5 | 1425762604012263360 |
| 6 | 1829651398830137742302620 |
[240,105856,342943680,8159542628448, 1425762604012263360,1829651398830137742302620] |