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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 46 |
| 4 | 202 |
| 5 | 914 |
| 6 | 4230 |
| 7 | 19872 |
| 8 | 94399 |
| 9 | 452259 |
| 10 | 2181014 |
| 11 | 10573296 |
| 12 | 51475524 |
| 13 | 251476927 |
| 14 | 1232106449 |
| 15 | 6051282793 |
| 16 | 29780747282 |
| 17 | 146818968545 |
| 18 | 724903922819 |
| 19 | 3583792136390 |
| 20 | 17737638719108 |
| 21 | 87877559572470 |
| 22 | 435750001845817 |
| 23 | 2162368515200979 |
| 24 | 10737843495197540 |
| 25 | 53353981611399815 |
| 26 | 265247173093336247 |
[1,3,11,46,202,914,4230,19872,94399,452259, 2181014,10573296,51475524,251476927,1232106449, 6051282793,29780747282,146818968545,724903922819, 3583792136390,17737638719108,87877559572470, 435750001845817,2162368515200979, 10737843495197540,53353981611399815, 265247173093336247] |