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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 22 |
| 9 | 289 |
| 10 | 2957 |
| 11 | 26073 |
| 12 | 208516 |
| 13 | 1558219 |
| 14 | 11087757 |
| 15 | 76079369 |
| 16 | 507834036 |
| 17 | 3318628468 |
| 18 | 21330628088 |
| 19 | 135325211035 |
| 20 | 849659803048 |
| 21 | 5290544985029 |
| 22 | 32722489543068 |
| 23 | 201296535411532 |
| 24 | 1232850239281547 |
| 25 | 7523511821702402 |
| 26 | 45777353201698899 |
| 27 | 277862479922939524 |
[1,22,289,2957,26073,208516,1558219,11087757, 76079369,507834036,3318628468,21330628088, 135325211035,849659803048,5290544985029, 32722489543068,201296535411532,1232850239281547, 7523511821702402,45777353201698899, 277862479922939524] |