The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 31 |
| 3 | 115 |
| 4 | 5965 |
| 5 | 22261 |
| 6 | 1157131 |
| 7 | 4318471 |
| 8 | 224477401 |
| 9 | 837761065 |
| 10 | 43547458615 |
| 11 | 162521328091 |
| 12 | 8447982493861 |
| 13 | 31528299888541 |
| 14 | 1638865056350371 |
| 15 | 6116327657048815 |
| 16 | 317931372949478065 |
| 17 | 1186536037167581521 |
| 18 | 61677047487142394191 |
| 19 | 230181874882853766211 |
[1,31,115,5965,22261,1157131,4318471,224477401, 837761065,43547458615,162521328091,8447982493861, 31528299888541,1638865056350371,6116327657048815, 317931372949478065,1186536037167581521, 61677047487142394191,230181874882853766211] |