| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 38 |
| 4 | 211 |
| 5 | 1182 |
| 6 | 7639 |
| 7 | 50738 |
| 8 | 368841 |
| 9 | 2767202 |
| 10 | 22132249 |
| 11 | 182624598 |
| 12 | 1582522891 |
| 13 | 14122521662 |
| 14 | 131109031239 |
| 15 | 1250794578818 |
| 16 | 12334766500561 |
| 17 | 124733099306562 |
| 18 | 1297921351160809 |
| 19 | 13821821639912198 |
| 20 | 150946171640101251 |
| 21 | 1684074507271422302 |
| 22 | 19217497036753475959 |
[1,2,9,38,211,1182,7639,50738,368841,2767202, 22132249,182624598,1582522891,14122521662, 131109031239,1250794578818,12334766500561, 124733099306562,1297921351160809, 13821821639912198,150946171640101251, 1684074507271422302,19217497036753475959] |