The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 33 |
| 3 | 2220 |
| 4 | 265132 |
| 5 | 49163241 |
| 6 | 13121450895 |
| 7 | 4762820449382 |
| 8 | 2257130616816421 |
| 9 | 1353302193751862072 |
| 10 | 1001440612663683369940 |
| 11 | 896481723303781965832069 |
| 12 | 954894526385647926192875010 |
| 13 | 1193519555165192704579377833814 |
[1,1,33,2220,265132,49163241,13121450895, 4762820449382,2257130616816421, 1353302193751862072,1001440612663683369940, 896481723303781965832069, 954894526385647926192875010, 1193519555165192704579377833814] |