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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 58 |
| 3 | 422 |
| 4 | 3070 |
| 5 | 22334 |
| 6 | 162478 |
| 7 | 1182014 |
| 8 | 8599054 |
| 9 | 62557406 |
| 10 | 455099950 |
| 11 | 3310814462 |
| 12 | 24085901134 |
| 13 | 175222936862 |
| 14 | 1274732360302 |
| 15 | 9273572395838 |
| 16 | 67464471491470 |
| 17 | 490798445231966 |
| 18 | 3570518059606702 |
| 19 | 25975223307710846 |
| 20 | 188967599273189326 |
| 21 | 1374723641527746974 |
[1,8,58,422,3070,22334,162478,1182014,8599054, 62557406,455099950,3310814462,24085901134, 175222936862,1274732360302,9273572395838, 67464471491470,490798445231966,3570518059606702, 25975223307710846,188967599273189326, 1374723641527746974] |