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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 29 |
| 4 | 122 |
| 5 | 514 |
| 6 | 2254 |
| 7 | 10027 |
| 8 | 45410 |
| 9 | 207523 |
| 10 | 959224 |
| 11 | 4462832 |
| 12 | 20905920 |
| 13 | 98460678 |
| 14 | 465872363 |
| 15 | 2213026310 |
| 16 | 10550448654 |
| 17 | 50449683620 |
| 18 | 241900053918 |
| 19 | 1162722150227 |
| 20 | 5600826084749 |
| 21 | 27031981353774 |
| 22 | 130701240726542 |
| 23 | 632959008475626 |
| 24 | 3069796368448293 |
| 25 | 14908391354774898 |
| 26 | 72491332397240089 |
[1,2,8,29,122,514,2254,10027,45410,207523,959224, 4462832,20905920,98460678,465872363,2213026310, 10550448654,50449683620,241900053918, 1162722150227,5600826084749,27031981353774, 130701240726542,632959008475626,3069796368448293, 14908391354774898,72491332397240089] |