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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 5 |
| 4 | 52 |
| 5 | 13525 |
| 6 | 9512132552 |
| 7 | 1223751003414213892335125 |
| 8 | 14245051228051734585272181044575005954679284643762013257552 |
[0,2,5,52,13525,9512132552, 1223751003414213892335125, 14245051228051734585272181044575005954679284643762\ 013257552] |