The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 352 |
| 3 | 9856 |
| 4 | 335104 |
| 5 | 13404160 |
| 6 | 616591360 |
| 7 | 32062750720 |
| 8 | 1859639541760 |
| 9 | 119016930672640 |
| 10 | 8331185147084800 |
| 11 | 633170071178444800 |
| 12 | 51919945836632473600 |
| 13 | 4568955233623657676800 |
| 14 | 429481791960623821619200 |
[1,16,352,9856,335104,13404160,616591360, 32062750720,1859639541760,119016930672640, 8331185147084800,633170071178444800, 51919945836632473600,4568955233623657676800, 429481791960623821619200] |