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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 36 |
| 3 | 442 |
| 4 | 6742 |
| 5 | 122350 |
| 6 | 2571620 |
| 7 | 61426282 |
| 8 | 1643616044 |
| 9 | 48708655760 |
| 10 | 1583981114700 |
| 11 | 56090062706944 |
| 12 | 2148733943483128 |
| 13 | 88554674908328872 |
| 14 | 3907197406833303644 |
| 15 | 183780036631720987407 |
| 16 | 9180785177015520963631 |
[1,4,36,442,6742,122350,2571620,61426282, 1643616044,48708655760,1583981114700, 56090062706944,2148733943483128,88554674908328872, 3907197406833303644,183780036631720987407, 9180785177015520963631] |