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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 4 |
| 2 | 8 |
| 3 | 272 |
| 4 | 15640 |
| 5 | 103504 |
| 6 | 203248 |
| 7 | 4712878048 |
| 8 | 994787896 |
| 9 | 29947918028368 |
| 10 | 19403266491914896 |
| 11 | 44494589501437664 |
| 12 | 1343012003853467792 |
| 13 | 940284256279455687458272 |
| 14 | 18264529537961367195872 |
| 15 | 13625209118796335138813851456 |
[2,4,8,272,15640,103504,203248,4712878048, 994787896,29947918028368,19403266491914896, 44494589501437664,1343012003853467792, 940284256279455687458272,18264529537961367195872, 13625209118796335138813851456] |