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| n | a(n) |
|---|---|
| 6 | 0 |
| 7 | 7 |
| 8 | 960 |
| 9 | 38637 |
| 10 | 882340 |
| 11 | 14413894 |
| 12 | 188690976 |
| 13 | 2112659718 |
| 14 | 21078701112 |
| 15 | 192648942945 |
| 16 | 1644431982848 |
| 17 | 13295963811083 |
| 18 | 102911255502876 |
| 19 | 768689550213368 |
| 20 | 5575887557096640 |
| 21 | 39473882067826332 |
| 22 | 273820542615005232 |
| 23 | 1867156445048432043 |
| 24 | 12548621876834960064 |
[0,7,960,38637,882340,14413894,188690976, 2112659718,21078701112,192648942945,1644431982848, 13295963811083,102911255502876,768689550213368, 5575887557096640,39473882067826332, 273820542615005232,1867156445048432043, 12548621876834960064] |