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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 5 |
| 4 | 22 |
| 5 | 51 |
| 6 | 314 |
| 7 | 1851 |
| 8 | 15876 |
| 9 | 139346 |
| 10 | 1719340 |
| 11 | 26691372 |
| 12 | 570681324 |
[1,3,5,22,51,314,1851,15876,139346,1719340, 26691372,570681324] |