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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 28 |
| 4 | 2539 |
| 5 | 847126 |
| 6 | 987474781 |
| 7 | 4267529230672 |
| 8 | 71328353711113801 |
| 9 | 4706871807383903992060 |
| 10 | 1236666872833000506726110479 |
| 11 | 1297665884376581511952494336126664 |
| 12 | 5444003907104081585974782986977125743035 |
| 13 | 91341304409373044577470623665964376840167100920 |
[1,1,1,28,2539,847126,987474781,4267529230672, 71328353711113801,4706871807383903992060, 1236666872833000506726110479, 1297665884376581511952494336126664, 5444003907104081585974782986977125743035, 91341304409373044577470623665964376840167100920] |