| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 29 |
| 5 | 129 |
| 6 | 757 |
| 7 | 5185 |
| 8 | 41155 |
| 9 | 368351 |
| 10 | 3671635 |
| 11 | 40295943 |
| 12 | 482758111 |
| 13 | 6268066531 |
| 14 | 87668492115 |
| 15 | 1314023850727 |
| 16 | 21011431917453 |
| 17 | 357014074280785 |
| 18 | 6423561495057421 |
| 19 | 122004755658629081 |
| 20 | 2439367774898883497 |
| 21 | 51213663674167659301 |
| 22 | 1126452985959434543237 |
[1,1,3,7,29,129,757,5185,41155,368351,3671635, 40295943,482758111,6268066531,87668492115, 1314023850727,21011431917453,357014074280785, 6423561495057421,122004755658629081, 2439367774898883497,51213663674167659301, 1126452985959434543237] |