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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 64 |
| 4 | 4096 |
| 5 | 264160 |
| 6 | 16906240 |
| 7 | 1082257408 |
| 8 | 69264474112 |
| 9 | 4432942899904 |
| 10 | 283708353851392 |
| 11 | 18157335711582208 |
| 12 | 1162069485541261312 |
| 13 | 74372447143871647744 |
| 14 | 4759836617207785455616 |
| 15 | 304629543505661931028480 |
[1,1,64,4096,264160,16906240,1082257408, 69264474112,4432942899904,283708353851392, 18157335711582208,1162069485541261312, 74372447143871647744,4759836617207785455616, 304629543505661931028480] |