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| n | a(n) |
|---|---|
| 1 | 36 |
| 2 | 1800 |
| 3 | 2700 |
| 4 | 17424 |
| 5 | 1306800 |
| 6 | 4769856 |
| 7 | 238492800 |
| 8 | 357739200 |
| 9 | 54531590400 |
[36,1800,2700,17424,1306800,4769856,238492800, 357739200,54531590400] |