The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | -4 |
| 4 | -51 |
| 5 | -304 |
| 6 | 125 |
| 7 | 34880 |
| 8 | 557753 |
| 9 | 3416320 |
| 10 | -74779911 |
| 11 | -2917151744 |
| 12 | -46015368443 |
| 13 | 115191402496 |
| 14 | 30429734385973 |
| 15 | 942941062774784 |
| 16 | 9925460231059185 |
| 17 | -471696770041053184 |
| 18 | -29508689065235461903 |
| 19 | -733077456673636089856 |
| 20 | 4714209123766494329021 |
[1,1,1,-4,-51,-304,125,34880,557753,3416320, -74779911,-2917151744,-46015368443,115191402496, 30429734385973,942941062774784,9925460231059185, -471696770041053184,-29508689065235461903, -733077456673636089856,4714209123766494329021] |