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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 1046 |
| 3 | 519918 |
| 4 | 681617304 |
| 5 | 1853340127320 |
| 6 | 9049964145536880 |
| 7 | 72083636411763075120 |
| 8 | 874164613833481641471360 |
| 9 | 15325066482283901592487889280 |
| 10 | 372998446683217113984893861356800 |
[1,9,1046,519918,681617304,1853340127320, 9049964145536880,72083636411763075120, 874164613833481641471360, 15325066482283901592487889280, 372998446683217113984893861356800] |