The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 8 |
| 3 | 32 |
| 4 | 384 |
| 5 | 2560 |
| 6 | 22528 |
| 7 | 172032 |
| 8 | 1409024 |
| 9 | 11141120 |
| 10 | 89653248 |
| 11 | 715128832 |
| 12 | 5729419264 |
| 13 | 45801799680 |
| 14 | 366548615168 |
| 15 | 2931852050432 |
| 16 | 23456963887104 |
| 17 | 187647121162240 |
| 18 | 1501211329036288 |
| 19 | 12009553193336832 |
| 20 | 96076975302508544 |
[1,0,8,32,384,2560,22528,172032,1409024,11141120, 89653248,715128832,5729419264,45801799680, 366548615168,2931852050432,23456963887104, 187647121162240,1501211329036288, 12009553193336832,96076975302508544] |