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| n | a(n) |
|---|---|
| 1 | 51474508 |
| 2 | 195351371872 |
| 3 | 761894242946484 |
| 4 | 2987170312757672908 |
| 5 | 11724359174003264630400 |
| 6 | 46027674099447532469280380 |
| 7 | 180705599017375127320670453920 |
| 8 | 709462514504983014544616127594356 |
[51474508,195351371872,761894242946484, 2987170312757672908,11724359174003264630400, 46027674099447532469280380, 180705599017375127320670453920, 709462514504983014544616127594356] |