The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | -5 |
| 4 | -23 |
| 5 | 521 |
| 6 | -1829 |
| 7 | -71021 |
| 8 | 1319697 |
| 9 | 5905297 |
| 10 | -683965709 |
| 11 | 8664974891 |
| 12 | 311864420473 |
| 13 | -13981842414695 |
| 14 | 6694007756619 |
| 15 | 16448800124183491 |
| 16 | -448649039951220959 |
| 17 | -13236887251789967071 |
| 18 | 1210629233913421852387 |
| 19 | -12065049302884271631269 |
[1,1,3,-5,-23,521,-1829,-71021,1319697,5905297, -683965709,8664974891,311864420473, -13981842414695,6694007756619,16448800124183491, -448649039951220959,-13236887251789967071, 1210629233913421852387,-12065049302884271631269] |