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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 10 |
| 6 | 28 |
| 7 | 154 |
| 8 | 3520 |
| 9 | 1551880 |
| 10 | 267593772160 |
| 11 | 7160642690122633501504 |
| 12 | 4661345794146064133843098964919305264116096 |
| 13 | 1810678717716933442325741630275004084414865420898591223522682022447438928019172629856 |
[1,1,2,3,5,10,28,154,3520,1551880,267593772160, 7160642690122633501504, 4661345794146064133843098964919305264116096, 18106787177169334423257416302750040844148654208985\ 91223522682022447438928019172629856] |