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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 351 |
| 4 | 56217 |
| 5 | 18878418 |
| 6 | 11163952389 |
| 7 | 10292468330630 |
| 8 | 13703363417260677 |
| 9 | 24932632800863823135 |
| 10 | 59509756600504616529186 |
| 11 | 180533923700628895521591343 |
| 12 | 678854993880375551144618682344 |
| 13 | 3100113915888360851262910882014885 |
[1,1,7,351,56217,18878418,11163952389, 10292468330630,13703363417260677, 24932632800863823135,59509756600504616529186, 180533923700628895521591343, 678854993880375551144618682344, 3100113915888360851262910882014885] |