| n | a(n) |
|---|---|
| 4 | 0 |
| 5 | 1 |
| 6 | 0 |
| 7 | 25 |
| 8 | 0 |
| 9 | 289 |
| 10 | 0 |
| 11 | 2025 |
| 12 | 0 |
| 13 | 16641 |
| 14 | 0 |
| 15 | 145161 |
| 16 | 0 |
| 17 | 1185921 |
| 18 | 0 |
| 19 | 9715689 |
| 20 | 0 |
| 21 | 80874049 |
| 22 | 0 |
| 23 | 668377609 |
| 24 | 0 |
| 25 | 5516478529 |
| 26 | 0 |
| 27 | 45630513769 |
| 28 | 0 |
| 29 | 377252695681 |
| 30 | 0 |
| 31 | 3117897783049 |
| 32 | 0 |
| 33 | 25774558228225 |
| 34 | 0 |
| 35 | 213069752354281 |
| 36 | 0 |
| 37 | 1761278190732225 |
| 38 | 0 |
| 39 | 14559352270703881 |
[0,1,0,25,0,289,0,2025,0,16641,0,145161,0,1185921, 0,9715689,0,80874049,0,668377609,0,5516478529,0, 45630513769,0,377252695681,0,3117897783049,0, 25774558228225,0,213069752354281,0, 1761278190732225,0,14559352270703881] |