The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 13 |
| 3 | 29 |
| 4 | 89 |
| 5 | 273 |
| 6 | 751 |
| 7 | 2221 |
| 8 | 6485 |
| 9 | 18647 |
| 10 | 54395 |
| 11 | 157947 |
| 12 | 457879 |
| 13 | 1330821 |
| 14 | 3863375 |
| 15 | 11214839 |
| 16 | 32568969 |
| 17 | 94558013 |
| 18 | 274542857 |
| 19 | 797165417 |
| 20 | 2314532695 |
| 21 | 6720246173 |
| 22 | 19512370773 |
| 23 | 56654003695 |
| 24 | 164495136155 |
| 25 | 477612471027 |
| 26 | 1386747980543 |
[3,13,29,89,273,751,2221,6485,18647,54395,157947, 457879,1330821,3863375,11214839,32568969,94558013, 274542857,797165417,2314532695,6720246173, 19512370773,56654003695,164495136155,477612471027, 1386747980543] |