The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 730 |
| 4 | 188790 |
| 5 | 102737670 |
| 6 | 102172297920 |
| 7 | 167870491048260 |
| 8 | 423971126389110300 |
| 9 | 1559445481095305703900 |
| 10 | 8010574937878696134151200 |
| 11 | 55572909620219147733302926200 |
| 12 | 506607333530572584517841616582600 |
| 13 | 5931728848766374810152582924943605000 |
[1,1,8,730,188790,102737670,102172297920, 167870491048260,423971126389110300, 1559445481095305703900,8010574937878696134151200, 55572909620219147733302926200, 506607333530572584517841616582600, 5931728848766374810152582924943605000] |