The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 48 |
| 5 | 30240 |
| 6 | 1596672000 |
| 7 | 18172937502720000 |
| 8 | 122457316443772566896640000 |
| 9 | 1284319496829094129116119090331648000000 |
| 10 | 55603466527142141932748234118927499493985767915520000000 |
| 11 | 26110840958525805673462196263372614726154694067746586937781385166848000000000 |
[1,1,1,2,48,30240,1596672000,18172937502720000, 122457316443772566896640000, 1284319496829094129116119090331648000000, 55603466527142141932748234118927499493985767915520\ 000000, 26110840958525805673462196263372614726154694067746\ 586937781385166848000000000] |