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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 30 |
| 3 | 476 |
| 4 | 16922 |
| 5 | 1328430 |
| 6 | 224738251 |
| 7 | 82830799570 |
| 8 | 66307508721755 |
| 9 | 115414300257319497 |
| 10 | 435721788093736397288 |
| 11 | 3576788708181112341917385 |
| 12 | 63678865525598948282213562255 |
| 13 | 2464034493065067438484568541197974 |
[4,30,476,16922,1328430,224738251,82830799570, 66307508721755,115414300257319497, 435721788093736397288,3576788708181112341917385, 63678865525598948282213562255, 2464034493065067438484568541197974] |