The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 13 |
| 3 | 41 |
| 4 | 653 |
| 5 | 2287 |
| 6 | 2723 |
| 7 | 5491 |
| 8 | 23240971 |
| 9 | 26823191 |
| 10 | 60249661 |
| 11 | 1841968537 |
| 12 | 2009317771 |
| 13 | 3044234903 |
| 14 | 3258336353 |
| 15 | 8166731261 |
| 16 | 9481619237 |
| 17 | 1281071245505271100098621541 |
| 18 | 1551605670846640136726379653 |
[1,13,41,653,2287,2723,5491,23240971,26823191, 60249661,1841968537,2009317771,3044234903, 3258336353,8166731261,9481619237, 1281071245505271100098621541, 1551605670846640136726379653] |