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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 71 |
| 3 | 631 |
| 4 | 5615 |
| 5 | 49967 |
| 6 | 444655 |
| 7 | 3956975 |
| 8 | 35213039 |
| 9 | 313360111 |
| 10 | 2788585199 |
| 11 | 24815562479 |
| 12 | 220833181423 |
| 13 | 1965189951215 |
| 14 | 17488185061103 |
| 15 | 155627000098543 |
| 16 | 1384921481277167 |
| 17 | 12324387851005679 |
| 18 | 109674474658262767 |
| 19 | 975990900074147567 |
| 20 | 8685322997859282671 |
[1,8,71,631,5615,49967,444655,3956975,35213039, 313360111,2788585199,24815562479,220833181423, 1965189951215,17488185061103,155627000098543, 1384921481277167,12324387851005679, 109674474658262767,975990900074147567, 8685322997859282671] |