The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 25 |
| 3 | 364 |
| 4 | 7713 |
| 5 | 216216 |
| 6 | 7568041 |
| 7 | 318256800 |
| 8 | 15644919681 |
| 9 | 880848974080 |
| 10 | 55912403743161 |
| 11 | 3951344780946432 |
| 12 | 307737594185310625 |
| 13 | 26190457718737019904 |
| 14 | 2418475248758250599625 |
| 15 | 240846113359411822759936 |
| 16 | 25731326615411044591298049 |
| 17 | 2935802801104074173428531200 |
[1,3,25,364,7713,216216,7568041,318256800, 15644919681,880848974080,55912403743161, 3951344780946432,307737594185310625, 26190457718737019904,2418475248758250599625, 240846113359411822759936, 25731326615411044591298049, 2935802801104074173428531200] |