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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 64 |
| 3 | 384 |
| 4 | 10116 |
| 5 | 174927 |
| 6 | 3842048 |
| 7 | 74367790 |
| 8 | 1462247321 |
| 9 | 29509300516 |
| 10 | 577847245296 |
| 11 | 11385134340072 |
| 12 | 225727859320572 |
| 13 | 4442739834521648 |
| 14 | 87589711996716421 |
| 15 | 1729226298092553854 |
| 16 | 34086490092213796815 |
[2,64,384,10116,174927,3842048,74367790, 1462247321,29509300516,577847245296, 11385134340072,225727859320572,4442739834521648, 87589711996716421,1729226298092553854, 34086490092213796815] |