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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 24 |
| 4 | 83 |
| 5 | 293 |
| 6 | 1055 |
| 7 | 3860 |
| 8 | 14299 |
| 9 | 53481 |
| 10 | 201551 |
| 11 | 764217 |
| 12 | 2912167 |
| 13 | 11143499 |
| 14 | 42791039 |
| 15 | 164812364 |
| 16 | 636438059 |
| 17 | 2463251009 |
| 18 | 9552773999 |
| 19 | 37112526989 |
| 20 | 144410649239 |
| 21 | 562724141459 |
| 22 | 2195581527359 |
| 23 | 8576490341249 |
| 24 | 33537507830423 |
| 25 | 131272552839203 |
| 26 | 514285886020255 |
[1,2,7,24,83,293,1055,3860,14299,53481,201551, 764217,2912167,11143499,42791039,164812364, 636438059,2463251009,9552773999,37112526989, 144410649239,562724141459,2195581527359, 8576490341249,33537507830423,131272552839203, 514285886020255] |