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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 85 |
| 4 | 1143 |
| 5 | 17053 |
| 6 | 276373 |
| 7 | 4721127 |
| 8 | 83916031 |
| 9 | 1537408202 |
| 10 | 28851490163 |
| 11 | 552095787772 |
| 12 | 10736758952835 |
| 13 | 211657839534446 |
| 14 | 4221164530621965 |
| 15 | 85031286025167082 |
| 16 | 1727896040082882283 |
| 17 | 35382865902724442331 |
| 18 | 729502230296220422918 |
| 19 | 15132164184348997874504 |
[1,1,9,85,1143,17053,276373,4721127,83916031, 1537408202,28851490163,552095787772, 10736758952835,211657839534446,4221164530621965, 85031286025167082,1727896040082882283, 35382865902724442331,729502230296220422918, 15132164184348997874504] |