The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 3 |
| 2 | 7 |
| 3 | 19 |
| 4 | 55 |
| 5 | 163 |
| 6 | 487 |
| 7 | 1459 |
| 8 | 4375 |
| 9 | 13123 |
| 10 | 39367 |
| 11 | 118099 |
| 12 | 354295 |
| 13 | 1062883 |
| 14 | 3188647 |
| 15 | 9565939 |
| 16 | 28697815 |
| 17 | 86093443 |
| 18 | 258280327 |
| 19 | 774840979 |
| 20 | 2324522935 |
| 21 | 6973568803 |
| 22 | 20920706407 |
| 23 | 62762119219 |
| 24 | 188286357655 |
| 25 | 564859072963 |
[2,3,7,19,55,163,487,1459,4375,13123,39367,118099, 354295,1062883,3188647,9565939,28697815,86093443, 258280327,774840979,2324522935,6973568803, 20920706407,62762119219,188286357655,564859072963] |