The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 3 |
| 5 | -40 |
| 6 | 250 |
| 7 | -1008 |
| 8 | 6937 |
| 9 | -107280 |
| 10 | 1460724 |
| 11 | -16878400 |
| 12 | 198206107 |
| 13 | -2751120216 |
| 14 | 45257093830 |
| 15 | -796023874800 |
| 16 | 14139937791153 |
| 17 | -259510939790752 |
| 18 | 5134675490787400 |
| 19 | -109869768885171456 |
[1,0,0,0,3,-40,250,-1008,6937,-107280,1460724, -16878400,198206107,-2751120216,45257093830, -796023874800,14139937791153,-259510939790752, 5134675490787400,-109869768885171456] |