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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 26 |
| 4 | 105 |
| 5 | 443 |
| 6 | 1931 |
| 7 | 8619 |
| 8 | 39138 |
| 9 | 180100 |
| 10 | 837279 |
| 11 | 3924640 |
| 12 | 18519066 |
| 13 | 87870877 |
| 14 | 418876055 |
| 15 | 2004669434 |
| 16 | 9626561780 |
| 17 | 46363330956 |
| 18 | 223866924604 |
| 19 | 1083384848069 |
| 20 | 5253395542429 |
| 21 | 25519189279554 |
| 22 | 124160104067499 |
| 23 | 604945683243907 |
| 24 | 2951277482140430 |
| 25 | 14414887009758621 |
| 26 | 70481444130319621 |
[1,2,7,26,105,443,1931,8619,39138,180100,837279, 3924640,18519066,87870877,418876055,2004669434, 9626561780,46363330956,223866924604,1083384848069, 5253395542429,25519189279554,124160104067499, 604945683243907,2951277482140430, 14414887009758621,70481444130319621] |