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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 25 |
| 4 | 765 |
| 5 | 3121 |
| 6 | 233275 |
| 7 | 823537 |
| 8 | 117440505 |
| 9 | 387420481 |
| 10 | 89999999991 |
| 11 | 285311670601 |
| 12 | 98077104930805 |
| 13 | 302875106592241 |
| 14 | 144456088732254195 |
| 15 | 437893890380859361 |
| 16 | 276701161105643274225 |
| 17 | 827240261886336764161 |
| 18 | 668888937280041138782191 |
| 19 | 1978419655660313589123961 |
[1,3,25,765,3121,233275,823537,117440505, 387420481,89999999991,285311670601,98077104930805, 302875106592241,144456088732254195, 437893890380859361,276701161105643274225, 827240261886336764161,668888937280041138782191, 1978419655660313589123961] |