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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 88 |
| 5 | 3939 |
| 6 | 534560 |
| 7 | 185986304 |
| 8 | 175655853776 |
| 9 | 437789918351688 |
| 10 | 2898697572048432368 |
| 11 | 50698981110982431863735 |
| 12 | 2342038257118692026082013568 |
| 13 | 285250169294740386915765591840768 |
| 14 | 91531011920509198679773321121428857296 |
| 15 | 77312253225939431362091700178995800855209496 |
[1,0,1,4,88,3939,534560,185986304,175655853776, 437789918351688,2898697572048432368, 50698981110982431863735, 2342038257118692026082013568, 285250169294740386915765591840768, 91531011920509198679773321121428857296, 77312253225939431362091700178995800855209496] |