The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| -1 | 1 |
| 0 | 1 |
| 1 | 6 |
| 2 | 72 |
| 3 | 1320 |
| 4 | 32760 |
| 5 | 1028160 |
| 6 | 39070080 |
| 7 | 1744364160 |
| 8 | 89513424000 |
| 9 | 5191778592000 |
| 10 | 335885501952000 |
| 11 | 23982224839372800 |
| 12 | 1873278229119897600 |
| 13 | 158905670470170624000 |
| 14 | 14547557832075620352000 |
| 15 | 1429628183315795054592000 |
| 16 | 150110959248158480732160000 |
[1,1,6,72,1320,32760,1028160,39070080,1744364160, 89513424000,5191778592000,335885501952000, 23982224839372800,1873278229119897600, 158905670470170624000,14547557832075620352000, 1429628183315795054592000, 150110959248158480732160000] |