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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 6 |
| 3 | 1 |
| 4 | 24 |
| 5 | 31 |
| 6 | 40 |
| 7 | 23 |
| 8 | 464 |
| 9 | 143 |
| 10 | 1632 |
| 11 | 1887 |
| 12 | 2688 |
| 13 | 255 |
| 14 | 31872 |
| 15 | 1919 |
| 16 | 123648 |
| 17 | 54015 |
| 18 | 408576 |
| 19 | 131071 |
| 20 | 1582080 |
| 21 | 2059263 |
| 22 | 2496512 |
| 23 | 3393535 |
| 24 | 19013632 |
| 25 | 33144831 |
| 26 | 25993216 |
| 27 | 205742079 |
| 28 | 50020352 |
| 29 | 1006845951 |
| 30 | 468877312 |
| 31 | 3456991231 |
| 32 | 736821248 |
| 33 | 16149446655 |
[1,0,6,1,24,31,40,23,464,143,1632,1887,2688,255, 31872,1919,123648,54015,408576,131071,1582080, 2059263,2496512,3393535,19013632,33144831, 25993216,205742079,50020352,1006845951,468877312, 3456991231,736821248,16149446655] |