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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 25 |
| 4 | 543 |
| 5 | 26566 |
| 6 | 2556342 |
| 7 | 435055552 |
| 8 | 120754619365 |
| 9 | 51350946391960 |
| 10 | 31851384417063656 |
| 11 | 27701908834589894664 |
| 12 | 32710404937218452511443 |
| 13 | 51052570219128509334656640 |
| 14 | 102965864527102952655273305600 |
| 15 | 263231815662641254658699835508896 |
[1,1,3,25,543,26566,2556342,435055552, 120754619365,51350946391960,31851384417063656, 27701908834589894664,32710404937218452511443, 51052570219128509334656640, 102965864527102952655273305600, 263231815662641254658699835508896] |