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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 8 |
| 5 | 18 |
| 6 | 24 |
| 7 | 96 |
| 8 | 152 |
| 9 | 204 |
| 10 | 296 |
| 11 | 566 |
| 12 | 703 |
| 13 | 1814 |
| 14 | 4342 |
| 15 | 4626 |
| 16 | 5412 |
| 17 | 6704 |
| 18 | 6752 |
| 19 | 7096 |
| 20 | 27004 |
| 21 | 37976 |
| 22 | 173251 |
[0,1,2,8,18,24,96,152,204,296,566,703,1814,4342, 4626,5412,6704,6752,7096,27004,37976,173251] |