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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 8 |
| 3 | 64 |
| 4 | 1024 |
| 5 | 31744 |
| 6 | 1935544 |
| 7 | 233799896 |
| 8 | 55948528920 |
| 9 | 26536519769600 |
| 10 | 24832233133823360 |
| 11 | 45900199968106888384 |
| 12 | 167513350972291906490904 |
| 13 | 1207375485963640678858065184 |
[2,8,64,1024,31744,1935544,233799896,55948528920, 26536519769600,24832233133823360, 45900199968106888384,167513350972291906490904, 1207375485963640678858065184] |