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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 63 |
| 4 | 847 |
| 5 | 18319 |
| 6 | 664335 |
| 7 | 41472271 |
| 8 | 4540159247 |
| 9 | 884033807631 |
| 10 | 309652466058511 |
| 11 | 196950960066643215 |
| 12 | 229271330666175448335 |
| 13 | 491789255473294398113039 |
| 14 | 1955120793071758250021405967 |
[1,1,7,63,847,18319,664335,41472271,4540159247, 884033807631,309652466058511,196950960066643215, 229271330666175448335,491789255473294398113039, 1955120793071758250021405967] |