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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 25764 |
| 9 | 0 |
| 10 | 450870 |
| 11 | 2795394 |
| 12 | 36685789 |
| 13 | 468994974 |
| 14 | 4741799790 |
| 15 | 40222705272 |
| 16 | 282354497019 |
| 17 | 1670741392215 |
| 18 | 8378734842802 |
| 19 | 35791510616904 |
| 20 | 130792381305999 |
| 21 | 410299386601373 |
| 22 | 1108537936510704 |
[1,0,0,0,0,0,0,0,25764,0,450870,2795394,36685789, 468994974,4741799790,40222705272,282354497019, 1670741392215,8378734842802,35791510616904, 130792381305999,410299386601373,1108537936510704] |