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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 16 |
| 5 | 80 |
| 6 | 400 |
| 7 | 10000 |
| 8 | 250000 |
| 9 | 48250000 |
| 10 | 83424250000 |
| 11 | 1441654464250000 |
| 12 | 24913230796704250000 |
| 13 | 5166032451235389984250000 |
| 14 | 1071233655120621702524064250000 |
| 15 | 3109835221395024747917162004384250000 |
| 16 | 135419643726614411057926317695276801184250000 |
[1,2,4,8,16,80,400,10000,250000,48250000, 83424250000,1441654464250000,24913230796704250000, 5166032451235389984250000, 1071233655120621702524064250000, 3109835221395024747917162004384250000, 135419643726614411057926317695276801184250000] |