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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 1457 |
| 4 | 112632827396 |
| 5 | 158158632767281777075441633086607 |
| 6 | 6800377846899806825426438402771408584453689087636553015800284773113817943589005365456 |
[1,1,4,1457,112632827396, 158158632767281777075441633086607, 68003778468998068254264384027714085844536890876365\ 53015800284773113817943589005365456] |