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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 18 |
| 5 | 101 |
| 6 | 1550 |
| 7 | 22492 |
| 8 | 424536 |
| 9 | 10283064 |
| 10 | 272319552 |
| 11 | 8959493401 |
| 12 | 328044534576 |
| 13 | 13799304374077 |
| 14 | 657306569855728 |
| 15 | 34694458662034731 |
| 16 | 2048559070407831424 |
| 17 | 132868259271772801185 |
| 18 | 9463476338179250300352 |
| 19 | 736376651361995115417850 |
| 20 | 62178423492630241909006224 |
| 21 | 5689134205956573233701281462 |
[1,0,1,1,18,101,1550,22492,424536,10283064, 272319552,8959493401,328044534576,13799304374077, 657306569855728,34694458662034731, 2048559070407831424,132868259271772801185, 9463476338179250300352,736376651361995115417850, 62178423492630241909006224, 5689134205956573233701281462] |