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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 17 |
| 4 | 0 |
| 5 | 0 |
| 6 | 2890 |
| 7 | 84490 |
| 8 | 1493688 |
| 9 | 32186168 |
| 10 | 810545040 |
| 11 | 23163353400 |
| 12 | 720663872500 |
| 13 | 24332866501372 |
| 14 | 887558454336372 |
| 15 | 34810380537375170 |
| 16 | 1460425852562219760 |
| 17 | 65255195022227232480 |
| 18 | 3093688414572173306128 |
| 19 | 155103564618621456778168 |
| 20 | 8198969255720346583303380 |
[0,0,0,17,0,0,2890,84490,1493688,32186168, 810545040,23163353400,720663872500,24332866501372, 887558454336372,34810380537375170, 1460425852562219760,65255195022227232480, 3093688414572173306128,155103564618621456778168, 8198969255720346583303380] |