| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 11 |
| 3 | 57 |
| 4 | 287 |
| 5 | 1436 |
| 6 | 7182 |
| 7 | 35912 |
| 8 | 179561 |
| 9 | 897807 |
| 10 | 4489037 |
| 11 | 22445186 |
| 12 | 112225932 |
| 13 | 561129662 |
| 14 | 2805648311 |
| 15 | 14028241557 |
| 16 | 70141207787 |
| 17 | 350706038936 |
| 18 | 1753530194682 |
| 19 | 8767650973412 |
| 20 | 43838254867061 |
| 21 | 219191274335307 |
| 22 | 1095956371676537 |
[2,11,57,287,1436,7182,35912,179561,897807, 4489037,22445186,112225932,561129662,2805648311, 14028241557,70141207787,350706038936, 1753530194682,8767650973412,43838254867061, 219191274335307,1095956371676537] |