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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 88 |
| 5 | 33600 |
| 6 | 3821760 |
| 7 | 272509552 |
| 8 | 15313310208 |
| 9 | 750469872312 |
| 10 | 33813251867920 |
| 11 | 1443455210369040 |
| 12 | 59454199364673024 |
| 13 | 2389923754993613176 |
| 14 | 94450458835284703536 |
| 15 | 3687585353084799432720 |
| 16 | 142691482885508987276800 |
| 17 | 5484263653598164634676600 |
| 18 | 209677462059979688650122960 |
[0,0,0,88,33600,3821760,272509552,15313310208, 750469872312,33813251867920,1443455210369040, 59454199364673024,2389923754993613176, 94450458835284703536,3687585353084799432720, 142691482885508987276800, 5484263653598164634676600, 209677462059979688650122960] |