The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 3 |
| 3 | -3 |
| 4 | -8 |
| 5 | -1 |
| 6 | -44 |
| 7 | -151 |
| 8 | 259 |
| 9 | -49 |
| 10 | -5250 |
| 11 | 17176 |
| 12 | 18870 |
| 13 | -443793 |
| 14 | 1765849 |
| 15 | 1813152 |
| 16 | -60621125 |
| 17 | 321255514 |
| 18 | -62856104 |
| 19 | -11540412088 |
| 20 | 88870982824 |
| 21 | -195655026297 |
| 22 | -2574468817607 |
| 23 | 32370146955580 |
| 24 | -155239071570949 |
| 25 | -402613805424503 |
| 26 | 13621655040570928 |
[1,3,3,-3,-8,-1,-44,-151,259,-49,-5250,17176, 18870,-443793,1765849,1813152,-60621125,321255514, -62856104,-11540412088,88870982824,-195655026297, -2574468817607,32370146955580,-155239071570949, -402613805424503,13621655040570928] |