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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 104 |
| 3 | 6598 |
| 4 | 778200 |
| 5 | 147293306 |
| 6 | 40870375036 |
| 7 | 15634022134518 |
| 8 | 7885949713950992 |
| 9 | 5071562424714844978 |
| 10 | 4050326064394675777988 |
| 11 | 3932747393021585152266894 |
| 12 | 4562459896809464230996563288 |
[1,4,104,6598,778200,147293306,40870375036, 15634022134518,7885949713950992, 5071562424714844978,4050326064394675777988, 3932747393021585152266894, 4562459896809464230996563288] |