The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 12 |
| 4 | 336 |
| 5 | 15760 |
| 6 | 1144704 |
| 7 | 117385920 |
| 8 | 16206548736 |
| 9 | 2897776619776 |
| 10 | 651455951990784 |
| 11 | 179856295521635328 |
| 12 | 59822762558026321920 |
| 13 | 23594335379577078059008 |
| 14 | 10887666560228980302446592 |
[1,0,12,336,15760,1144704,117385920,16206548736, 2897776619776,651455951990784,179856295521635328, 59822762558026321920,23594335379577078059008, 10887666560228980302446592] |