The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 22 |
| 4 | 125 |
| 5 | 948 |
| 6 | 8627 |
| 7 | 86618 |
| 8 | 970649 |
| 9 | 13105048 |
| 10 | 206672615 |
| 11 | 3084750894 |
| 12 | 39005776445 |
| 13 | 972651041372 |
| 14 | 45030832321499 |
| 15 | 489627529809250 |
| 16 | -65060172242461567 |
| 17 | 100399556385989760 |
| 18 | 378285729309697789679 |
| 19 | 921583343151423434486 |
| 20 | -2826260367937145199562267 |
[1,1,5,22,125,948,8627,86618,970649,13105048, 206672615,3084750894,39005776445,972651041372, 45030832321499,489627529809250,-65060172242461567, 100399556385989760,378285729309697789679, 921583343151423434486,-2826260367937145199562267] |