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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 63 |
| 3 | 448 |
| 4 | 2945 |
| 5 | 18648 |
| 6 | 114751 |
| 7 | 691712 |
| 8 | 4104513 |
| 9 | 24054760 |
| 10 | 139564799 |
| 11 | 803057472 |
| 12 | 4588713025 |
| 13 | 26065001144 |
| 14 | 147300132735 |
| 15 | 828731846656 |
| 16 | 4644352060289 |
| 17 | 25937665418952 |
| 18 | 144408961949887 |
| 19 | 801775363578560 |
| 20 | 4440421256749569 |
| 21 | 24536336868622744 |
| 22 | 135299766571990463 |
[8,63,448,2945,18648,114751,691712,4104513, 24054760,139564799,803057472,4588713025, 26065001144,147300132735,828731846656, 4644352060289,25937665418952,144408961949887, 801775363578560,4440421256749569, 24536336868622744,135299766571990463] |