The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 25 |
| 4 | 697 |
| 5 | 87261 |
| 6 | 63362851 |
| 7 | 319794398533 |
| 8 | 12896670350677905 |
| 9 | 4680059818474453354777 |
| 10 | 16983047870459137946598471811 |
| 11 | 677909112049327323648624151866814641 |
[1,1,3,25,697,87261,63362851,319794398533, 12896670350677905,4680059818474453354777, 16983047870459137946598471811, 677909112049327323648624151866814641] |