The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 8 | 1 |
| 9 | 36 |
| 10 | 750 |
| 11 | 12540 |
| 12 | 195459 |
| 13 | 3057912 |
| 14 | 49471708 |
| 15 | 835659825 |
| 16 | 14779601837 |
| 17 | 273850769192 |
| 18 | 5313937212402 |
| 19 | 107889695430426 |
| 20 | 2289283137461287 |
| 21 | 50700986253094800 |
| 22 | 1170451253565199375 |
| 23 | 28127697404018935030 |
| 24 | 702741240223958509651 |
| 25 | 18230243438652550293450 |
[1,36,750,12540,195459,3057912,49471708,835659825, 14779601837,273850769192,5313937212402, 107889695430426,2289283137461287, 50700986253094800,1170451253565199375, 28127697404018935030,702741240223958509651, 18230243438652550293450] |