The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 7 | 61 |
| 8 | 1385 |
| 9 | 24568 |
| 10 | 408360 |
| 11 | 6749040 |
| 12 | 113760240 |
| 13 | 1979524800 |
| 14 | 35773657920 |
| 15 | 673354281600 |
| 16 | 13216073270400 |
| 17 | 270530842982400 |
| 18 | 5773216280832000 |
| 19 | 128349384991027200 |
| 20 | 2969966735543808000 |
| 21 | 71458612085532672000 |
| 22 | 1785854823949228032000 |
| 23 | 46308904323109908480000 |
[61,1385,24568,408360,6749040,113760240, 1979524800,35773657920,673354281600, 13216073270400,270530842982400,5773216280832000, 128349384991027200,2969966735543808000, 71458612085532672000,1785854823949228032000, 46308904323109908480000] |