| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 15 |
| 4 | 109 |
| 5 | 1053 |
| 6 | 12767 |
| 7 | 186763 |
| 8 | 3204313 |
| 9 | 63128665 |
| 10 | 1404963387 |
| 11 | 34867190823 |
| 12 | 954800951749 |
| 13 | 28600649870133 |
| 14 | 930325531322519 |
| 15 | 32658109219519843 |
| 16 | 1230609634110271921 |
| 17 | 49545182501048868145 |
[1,1,3,15,109,1053,12767,186763,3204313,63128665, 1404963387,34867190823,954800951749, 28600649870133,930325531322519,32658109219519843, 1230609634110271921,49545182501048868145] |