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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 1 |
| 4 | 7 |
| 5 | 63 |
| 6 | 231 |
| 7 | 429 |
| 8 | 1287 |
| 9 | 2431 |
| 10 | 46189 |
| 11 | 88179 |
| 12 | 676039 |
| 13 | 52003 |
| 14 | 200583 |
| 15 | 1938969 |
| 16 | 60108039 |
| 17 | 116680311 |
| 18 | 90751353 |
| 19 | 176726319 |
| 20 | 6892326441 |
| 21 | 13456446861 |
| 22 | 52602474093 |
| 23 | 20583576819 |
| 24 | 322476036831 |
| 25 | 15801325804719 |
| 26 | 61989816618513 |
| 27 | 121683714103007 |
| 28 | 191217265019011 |
| 29 | 375840831244263 |
| 30 | 7391536347803839 |
[1,1,3,1,7,63,231,429,1287,2431,46189,88179, 676039,52003,200583,1938969,60108039,116680311, 90751353,176726319,6892326441,13456446861, 52602474093,20583576819,322476036831, 15801325804719,61989816618513,121683714103007, 191217265019011,375840831244263,7391536347803839] |