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| n | a(n) |
|---|---|
| 8 | 0 |
| 9 | 31520 |
| 10 | 434127 |
| 11 | 3979676 |
| 12 | 29836261 |
| 13 | 200251036 |
| 14 | 1269799244 |
| 15 | 7866814026 |
| 16 | 48627012403 |
| 17 | 305484315674 |
| 18 | 1970229533360 |
| 19 | 12885942393622 |
| 20 | 84719993481585 |
| 21 | 556551975117208 |
| 22 | 3639388789709545 |
| 23 | 23644099935731588 |
| 24 | 152553455368658432 |
| 25 | 978410935801325180 |
| 26 | 6248373677853677799 |
[0,31520,434127,3979676,29836261,200251036, 1269799244,7866814026,48627012403,305484315674, 1970229533360,12885942393622,84719993481585, 556551975117208,3639388789709545, 23644099935731588,152553455368658432, 978410935801325180,6248373677853677799] |