The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 240 |
| 3 | 448 |
| 4 | 138240 |
| 5 | 225280 |
| 6 | 402554880 |
| 7 | 1857945600 |
| 8 | 1010722406400 |
| 9 | 301234913280 |
| 10 | 5859811786752 |
| 11 | 55010477998080 |
| 12 | 9141306387333120000 |
| 13 | 7898088718655815680 |
| 14 | 1017975879293416243200 |
| 15 | 161212016644168089600 |
[1,6,240,448,138240,225280,402554880,1857945600, 1010722406400,301234913280,5859811786752, 55010477998080,9141306387333120000, 7898088718655815680,1017975879293416243200, 161212016644168089600] |