The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 292 |
| 3 | 52020 |
| 4 | 9504288 |
| 5 | 29484180000 |
| 6 | 17168660000 |
| 7 | 801669704780000 |
| 8 | 35930841355360000 |
| 9 | 1250077234358967840000 |
| 10 | 36426677336311407264000 |
| 11 | 11464402743063221545440000 |
| 12 | 42860453128110714373355232000 |
[1,5,292,52020,9504288,29484180000,17168660000, 801669704780000,35930841355360000, 1250077234358967840000,36426677336311407264000, 11464402743063221545440000, 42860453128110714373355232000] |