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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 84 |
| 3 | 0 |
| 4 | 17792 |
| 5 | 0 |
| 6 | 3813004 |
| 7 | 0 |
| 8 | 817415641 |
| 9 | 0 |
| 10 | 175230221888 |
| 11 | 0 |
| 12 | 37564072017396 |
| 13 | 0 |
| 14 | 8052596858631830 |
| 15 | 0 |
| 16 | 1726232153308945597 |
| 17 | 0 |
| 18 | 370051730646797787514 |
| 19 | 0 |
| 20 | 79327848710774305638388 |
| 21 | 0 |
| 22 | 17005480743351155889065248 |
| 23 | 0 |
[0,84,0,17792,0,3813004,0,817415641,0, 175230221888,0,37564072017396,0,8052596858631830, 0,1726232153308945597,0,370051730646797787514,0, 79327848710774305638388,0, 17005480743351155889065248,0] |