The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 22 |
| 4 | 27 |
| 5 | 103 |
| 6 | 439 |
| 7 | 4054 |
| 8 | 16655 |
| 9 | 54019 |
| 10 | 70674 |
| 11 | 336715 |
| 12 | 744104 |
| 13 | 1824923 |
| 14 | 102939792 |
| 15 | 207704507 |
| 16 | 518348806 |
| 17 | 2281099731 |
| 18 | 2799448537 |
| 19 | 10679445342 |
| 20 | 45517229905 |
| 21 | 420334514487 |
| 22 | 1726855287853 |
| 23 | 5600900378046 |
| 24 | 7327755665899 |
| 25 | 34911923041642 |
[1,2,5,22,27,103,439,4054,16655,54019,70674, 336715,744104,1824923,102939792,207704507, 518348806,2281099731,2799448537,10679445342, 45517229905,420334514487,1726855287853, 5600900378046,7327755665899,34911923041642] |