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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 16 |
| 3 | 512 |
| 4 | 37976 |
| 5 | 8210464 |
| 6 | 4708773306 |
| 7 | 6787471566616 |
| 8 | 25828698626846656 |
| 9 | 247502169348575094540 |
| 10 | 6064620415913633106142608 |
[2,16,512,37976,8210464,4708773306,6787471566616, 25828698626846656,247502169348575094540, 6064620415913633106142608] |