The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 7 |
| 3 | 25 |
| 4 | 95 |
| 5 | 393 |
| 6 | 1711 |
| 7 | 7741 |
| 8 | 36007 |
| 9 | 171097 |
| 10 | 826839 |
| 11 | 4050957 |
| 12 | 20074303 |
| 13 | 100438233 |
| 14 | 506677279 |
| 15 | 2574292749 |
| 16 | 13161031191 |
| 17 | 67656253081 |
| 18 | 349499197799 |
| 19 | 1813347470669 |
| 20 | 9445448148975 |
| 21 | 49375113712089 |
| 22 | 258938850241327 |
[1,3,7,25,95,393,1711,7741,36007,171097,826839, 4050957,20074303,100438233,506677279,2574292749, 13161031191,67656253081,349499197799, 1813347470669,9445448148975,49375113712089, 258938850241327] |