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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 55 |
| 4 | 14187 |
| 5 | 314681540 |
| 6 | 254841004490568887 |
| 7 | 116515298784769863036311841843812470 |
| 8 | 16752745298264669840183664790312981823804061660537952218518280274360024 |
[0,1,5,55,14187,314681540,254841004490568887, 116515298784769863036311841843812470, 16752745298264669840183664790312981823804061660537\ 952218518280274360024] |