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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 16 |
| 3 | 496 |
| 4 | 63488 |
| 5 | 32899584 |
| 6 | 68048945152 |
| 7 | 560546063546368 |
| 8 | 18415227534711980032 |
| 9 | 2416302301874471529480192 |
| 10 | 1267360472364492854214927581184 |
| 11 | 2658246833130441862918267501949222912 |
[1,2,16,496,63488,32899584,68048945152, 560546063546368,18415227534711980032, 2416302301874471529480192, 1267360472364492854214927581184, 2658246833130441862918267501949222912] |