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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 139 |
| 3 | 11928 |
| 4 | 1909787 |
| 5 | 491329088 |
| 6 | 185373016419 |
| 7 | 96425597012608 |
| 8 | 66139668570414571 |
| 9 | 57840395870803141632 |
| 10 | 62813828698519808489915 |
| 11 | 82933938539372018962724864 |
| 12 | 130828514220436815006398809563 |
| 13 | 243020960809424084526916839817216 |
| 14 | 525038425527430196237626528753654867 |
[1,4,139,11928,1909787,491329088,185373016419, 96425597012608,66139668570414571, 57840395870803141632,62813828698519808489915, 82933938539372018962724864, 130828514220436815006398809563, 243020960809424084526916839817216, 525038425527430196237626528753654867] |