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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 4 |
| 3 | 16 |
| 4 | 25 |
| 5 | 121 |
| 6 | 5041 |
| 7 | 5041 |
| 8 | 0 |
| 9 | 2504902401 |
| 10 | 0 |
| 11 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 0 |
| 15 | 0 |
| 16 | 0 |
| 17 | 0 |
| 18 | 0 |
| 19 | 0 |
| 20 | 0 |
| 21 | 0 |
| 22 | 0 |
| 23 | 0 |
| 24 | 0 |
[4,4,16,25,121,5041,5041,0,2504902401,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0] |