The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 54 |
| 4 | 992 |
| 5 | 26905 |
| 6 | 995512 |
| 7 | 47801348 |
| 8 | 2874725632 |
| 9 | 210779874753 |
| 10 | 18449217421736 |
| 11 | 1895296727424034 |
| 12 | 225357842422851712 |
| 13 | 30654651465700321241 |
| 14 | 4723260976024367542144 |
| 15 | 817341855394754961120696 |
| 16 | 157673457776213194720120832 |
| 17 | 33688113119931694926084379969 |
[1,1,5,54,992,26905,995512,47801348,2874725632, 210779874753,18449217421736,1895296727424034, 225357842422851712,30654651465700321241, 4723260976024367542144,817341855394754961120696, 157673457776213194720120832, 33688113119931694926084379969] |