The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 9 |
| 1 | 2 |
| 2 | 4 |
| 3 | 21 |
| 4 | 2942 |
| 5 | 53513091 |
| 6 | 167326045060176459 |
| 7 | 28151219628621255951104435939025563 |
| 8 | 1114022548504683064752039841443977072775869961232641319345703597106467 |
[9,2,4,21,2942,53513091,167326045060176459, 28151219628621255951104435939025563, 11140225485046830647520398414439770727758699612326\ 41319345703597106467] |