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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 36 |
| 4 | 144 |
| 5 | 576 |
| 6 | 3600 |
| 7 | 14400 |
| 8 | 921600 |
| 9 | 1040400 |
| 10 | 4161600 |
| 11 | 8643600 |
| 12 | 34574400 |
| 13 | 266342400 |
| 14 | 700131600 |
| 15 | 2800526400 |
| 16 | 179233689600 |
| 17 | 202338032400 |
| 18 | 809352129600 |
[1,2,36,144,576,3600,14400,921600,1040400,4161600, 8643600,34574400,266342400,700131600,2800526400, 179233689600,202338032400,809352129600] |