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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 105 |
| 3 | 425 |
| 4 | 144925 |
| 5 | 580125 |
| 6 | 243697125 |
| 7 | 46420625 |
| 8 | 253459513125 |
[1,5,105,425,144925,580125,243697125,46420625, 253459513125] |