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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 583 |
| 3 | 9360 |
| 4 | 135373 |
| 5 | 1838130 |
| 6 | 23972131 |
| 7 | 304421700 |
| 8 | 3797192905 |
| 9 | 46789978950 |
| 10 | 571763347519 |
| 11 | 6946889160120 |
| 12 | 84072723694597 |
| 13 | 1014722669092890 |
| 14 | 12224658793966747 |
| 15 | 147088107868298220 |
[1,30,583,9360,135373,1838130,23972131,304421700, 3797192905,46789978950,571763347519,6946889160120, 84072723694597,1014722669092890,12224658793966747, 147088107868298220] |