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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 128 |
| 3 | 43712 |
| 4 | 178978816 |
| 5 | 9382678180864 |
| 6 | 6558857974821945344 |
| 7 | 62879510456046477909016576 |
| 8 | 8439543050458648574249946721550336 |
| 9 | 16110026905906831711301708576024644666261504 |
[1,4,128,43712,178978816,9382678180864, 6558857974821945344,62879510456046477909016576, 8439543050458648574249946721550336, 16110026905906831711301708576024644666261504] |