The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 90 |
| 4 | 1114 |
| 5 | 16739 |
| 6 | 296675 |
| 7 | 6061476 |
| 8 | 140279204 |
| 9 | 3627063605 |
| 10 | 103627063605 |
| 11 | 3242055440326 |
| 12 | 110235260819398 |
| 13 | 4047611646518687 |
| 14 | 159615707204330911 |
| 15 | 6728024062917221536 |
| 16 | 301875929242270047392 |
| 17 | 14364960381309995038401 |
[1,9,90,1114,16739,296675,6061476,140279204, 3627063605,103627063605,3242055440326, 110235260819398,4047611646518687, 159615707204330911,6728024062917221536, 301875929242270047392,14364960381309995038401] |