The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 29 |
| 5 | 6 |
| 6 | 1027 |
| 7 | 8 |
| 8 | 26889 |
| 9 | 272170 |
| 10 | 861851 |
| 11 | 12 |
| 12 | 515592013 |
| 13 | 14 |
| 14 | 1530809295 |
| 15 | 668366899216 |
| 16 | 9382044672017 |
| 17 | 18 |
| 18 | 1405750464518419 |
| 19 | 20 |
| 20 | 1393382139935385621 |
| 21 | 4274473667143680022 |
| 22 | 30537988748467223 |
| 23 | 24 |
| 24 | 211745638285336995840025 |
[1,3,4,29,6,1027,8,26889,272170,861851,12, 515592013,14,1530809295,668366899216, 9382044672017,18,1405750464518419,20, 1393382139935385621,4274473667143680022, 30537988748467223,24,211745638285336995840025] |