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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 112 |
| 4 | 2240 |
| 5 | 58240 |
| 6 | 1863680 |
| 7 | 70819840 |
| 8 | 3116072960 |
| 9 | 155803648000 |
| 10 | 8725004288000 |
| 11 | 540950265856000 |
| 12 | 36784618078208000 |
| 13 | 2722061737787392000 |
| 14 | 217764939022991360000 |
| 15 | 18727784755977256960000 |
| 16 | 1722956197549907640320000 |
| 17 | 168849707359890948751360000 |
[1,8,112,2240,58240,1863680,70819840,3116072960, 155803648000,8725004288000,540950265856000, 36784618078208000,2722061737787392000, 217764939022991360000,18727784755977256960000, 1722956197549907640320000, 168849707359890948751360000] |