The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 28 |
| 2 | 364 |
| 3 | 6916 |
| 4 | 214396 |
| 5 | 7932652 |
| 6 | 341104036 |
| 7 | 20807346196 |
| 8 | 1394092195132 |
| 9 | 101768730244636 |
| 10 | 8039729689326244 |
| 11 | 779853779864645668 |
| 12 | 80324939326058503804 |
| 13 | 8755418386540376914636 |
| 14 | 1111938135090627868158772 |
[4,28,364,6916,214396,7932652,341104036, 20807346196,1394092195132,101768730244636, 8039729689326244,779853779864645668, 80324939326058503804,8755418386540376914636, 1111938135090627868158772] |