The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 113 |
| 5 | 2861 |
| 6 | 709 |
| 7 | 45601 |
| 8 | 408809 |
| 9 | 49595489 |
| 10 | 2426258561 |
| 11 | 485934733 |
| 12 | 485460413 |
| 13 | 2429223061 |
| 14 | 2427480661 |
| 15 | 1284905668069 |
| 16 | 217047437215261 |
| 17 | 182605590283392901 |
| 18 | 36508279615059377 |
| 19 | 36518889897389297 |
[1,3,13,113,2861,709,45601,408809,49595489, 2426258561,485934733,485460413,2429223061, 2427480661,1284905668069,217047437215261, 182605590283392901,36508279615059377, 36518889897389297] |