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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 5 |
| 3 | 0 |
| 4 | 1992 |
| 5 | 0 |
| 6 | 6167551 |
| 7 | 0 |
| 8 | 73432708224 |
| 9 | 0 |
| 10 | 2389444075877425 |
| 11 | 0 |
| 12 | 173496878823412858880 |
| 13 | 0 |
| 14 | 24573448663070711791073155 |
| 15 | 0 |
| 16 | 6168942712247503719875933929472 |
| 17 | 0 |
| 18 | 2554865971518520622455831203134760669 |
| 19 | 0 |
| 20 | 1650933998542152349112398040415912949710848 |
| 21 | 0 |
[1,0,5,0,1992,0,6167551,0,73432708224,0, 2389444075877425,0,173496878823412858880,0, 24573448663070711791073155,0, 6168942712247503719875933929472,0, 2554865971518520622455831203134760669,0, 1650933998542152349112398040415912949710848,0] |