The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 147 |
| 4 | 5032 |
| 5 | 274765 |
| 6 | 21702096 |
| 7 | 2327543743 |
| 8 | 324317092352 |
| 9 | 56816985879801 |
| 10 | 12201268360672000 |
| 11 | 3147485927264980411 |
| 12 | 959356469360927222784 |
| 13 | 340785570064053310187173 |
| 14 | 139449094593887763170361344 |
| 15 | 65080820095941557895304404375 |
[1,1,8,147,5032,274765,21702096,2327543743, 324317092352,56816985879801,12201268360672000, 3147485927264980411,959356469360927222784, 340785570064053310187173, 139449094593887763170361344, 65080820095941557895304404375] |