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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 5408 |
| 3 | 0 |
| 4 | 4878016 |
| 5 | 0 |
| 6 | 1763889504 |
| 7 | 0 |
| 8 | 342948774272 |
| 9 | 0 |
| 10 | 41701747803040 |
| 11 | 0 |
| 12 | 3480013344595008 |
| 13 | 0 |
| 14 | 212293851572113376 |
| 15 | 0 |
| 16 | 9911860859743707904 |
| 17 | 0 |
| 18 | 366787510164531304992 |
| 19 | 0 |
| 20 | 11058305237821938399680 |
| 21 | 0 |
| 22 | 277765870809660966979168 |
| 23 | 0 |
| 24 | 5921283575038332646294656 |
| 25 | 0 |
| 26 | 108808265072142686985320608 |
| 27 | 117093590311632896 |
[1,0,5408,0,4878016,0,1763889504,0,342948774272,0, 41701747803040,0,3480013344595008,0, 212293851572113376,0,9911860859743707904,0, 366787510164531304992,0,11058305237821938399680,0, 277765870809660966979168,0, 5921283575038332646294656,0, 108808265072142686985320608,117093590311632896] |