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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 25 |
| 3 | 165 |
| 4 | 1625 |
| 5 | 25509 |
| 6 | 664665 |
| 7 | 29559717 |
| 8 | 2290267225 |
| 9 | 314039061413 |
| 10 | 77160820913241 |
| 11 | 34317392762489765 |
| 12 | 27859502236825957465 |
| 13 | 41575811106337540656037 |
| 14 | 114746581654195790543205465 |
| 15 | 588765612737696531880325270437 |
| 16 | 5642056933026209681424588087899225 |
[1,5,25,165,1625,25509,664665,29559717,2290267225, 314039061413,77160820913241,34317392762489765, 27859502236825957465,41575811106337540656037, 114746581654195790543205465, 588765612737696531880325270437, 5642056933026209681424588087899225] |