The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 31 |
| 5 | 211 |
| 6 | 2311 |
| 7 | 43891 |
| 8 | 60653 |
| 9 | 870871 |
| 10 | 1023053 |
| 11 | 13123111 |
| 12 | 19417793 |
| 13 | 300690391 |
| 14 | 446235509 |
| 15 | 6915878971 |
| 16 | 12939711677 |
| 17 | 200560490131 |
[1,3,7,31,211,2311,43891,60653,870871,1023053, 13123111,19417793,300690391,446235509,6915878971, 12939711677,200560490131] |