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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 85 |
| 5 | 2928 |
| 6 | 314925 |
| 7 | 84974760 |
| 8 | 63327890015 |
| 9 | 123670531939440 |
| 10 | 644385861467631972 |
| 11 | 8853970669063185618000 |
| 12 | 321538767413685546538468385 |
| 13 | 30768712746239178236068160093280 |
| 14 | 7755868453482819803691622493685140880 |
| 15 | 5144106193113274410507722020733942141881664 |
[1,1,5,85,2928,314925,84974760,63327890015, 123670531939440,644385861467631972, 8853970669063185618000, 321538767413685546538468385, 30768712746239178236068160093280, 7755868453482819803691622493685140880, 5144106193113274410507722020733942141881664] |