The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 17 |
| 6 | 29 |
| 7 | 97 |
| 8 | 473 |
| 9 | 2981 |
| 10 | 21253 |
| 11 | 221233 |
| 12 | 1979801 |
| 13 | 27911349 |
| 14 | 414463777 |
| 15 | 10310356843 |
| 16 | 228677282931 |
| 17 | 8215295336657 |
| 18 | 272807472524325 |
[1,1,1,1,17,29,97,473,2981,21253,221233,1979801, 27911349,414463777,10310356843,228677282931, 8215295336657,272807472524325] |