The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 8 |
| 2 | 290 |
| 3 | 28968 |
| 4 | 5681090 |
| 5 | 1842232328 |
| 6 | 892470398690 |
| 7 | 603895065822888 |
| 8 | 544044172956617090 |
| 9 | 629546390483091920648 |
| 10 | 909985134104496272880290 |
| 11 | 1606847778379674628032205608 |
| 12 | 3403564972080411622205113812290 |
[2,8,290,28968,5681090,1842232328,892470398690, 603895065822888,544044172956617090, 629546390483091920648,909985134104496272880290, 1606847778379674628032205608, 3403564972080411622205113812290] |