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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 6 |
| 4 | 0 |
| 5 | 4 |
| 6 | 2463 |
| 7 | 252 |
| 8 | 0 |
| 9 | 129 |
| 10 | 168710720 |
| 11 | 2360896 |
| 12 | 98560 |
| 13 | 0 |
| 14 | 43968 |
| 15 | 2463965471530395 |
| 16 | 3853366387000 |
| 17 | 18229845000 |
| 18 | 474718605 |
| 19 | 0 |
| 20 | 254429900 |
| 21 | 14314557500958748403432016 |
| 22 | 1835239210644761036784 |
| 23 | 775664270273023776 |
| 24 | 1904255124528024 |
| 25 | 39627683503488 |
| 26 | 0 |
| 27 | 30468670170912 |
[1,0,1,6,0,4,2463,252,0,129,168710720,2360896, 98560,0,43968,2463965471530395,3853366387000, 18229845000,474718605,0,254429900, 14314557500958748403432016,1835239210644761036784, 775664270273023776,1904255124528024, 39627683503488,0,30468670170912] |