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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 36 |
| 5 | 876 |
| 6 | 408696 |
| 7 | 83762796636 |
| 8 | 3508125906207095591916 |
| 9 | 6153473687096578758445014683368786661634996 |
| 10 | 18932619208894981833333582059033329370801260096062214926751788496235698477988081702676 |
[1,1,2,6,36,876,408696,83762796636, 3508125906207095591916, 6153473687096578758445014683368786661634996, 18932619208894981833333582059033329370801260096062\ 214926751788496235698477988081702676] |