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| n | a(n) |
|---|---|
| 0 | 16777216 |
| 1 | 6975757441 |
| 2 | 208827064576 |
| 3 | 2251875390625 |
| 4 | 14048223625216 |
| 5 | 62259690411361 |
| 6 | 218340105584896 |
| 7 | 645753531245761 |
| 8 | 1677721600000000 |
| 9 | 3936588805702081 |
| 10 | 8507630225817856 |
| 11 | 17181861798319201 |
| 12 | 32784148919812096 |
[16777216,6975757441,208827064576,2251875390625, 14048223625216,62259690411361,218340105584896, 645753531245761,1677721600000000,3936588805702081, 8507630225817856,17181861798319201, 32784148919812096] |