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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 16 |
| 4 | 36 |
| 5 | 144 |
| 6 | 576 |
| 7 | 3600 |
| 8 | 14400 |
| 9 | 32400 |
| 10 | 129600 |
| 11 | 291600 |
| 12 | 1166400 |
| 13 | 8643600 |
| 14 | 34574400 |
| 15 | 77792400 |
| 16 | 84272400 |
| 17 | 311169600 |
| 18 | 337089600 |
| 19 | 700131600 |
| 20 | 2800526400 |
| 21 | 179233689600 |
| 22 | 202338032400 |
| 23 | 809352129600 |
[1,4,16,36,144,576,3600,14400,32400,129600,291600, 1166400,8643600,34574400,77792400,84272400, 311169600,337089600,700131600,2800526400, 179233689600,202338032400,809352129600] |