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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 9 |
| 4 | 28 |
| 5 | 97 |
| 6 | 346 |
| 7 | 1302 |
| 8 | 5014 |
| 9 | 19830 |
| 10 | 79813 |
| 11 | 326344 |
| 12 | 1350918 |
| 13 | 5652334 |
| 14 | 23861787 |
| 15 | 101519790 |
| 16 | 434827232 |
| 17 | 1873491739 |
| 18 | 8114411769 |
| 19 | 35309142309 |
| 20 | 154288183928 |
| 21 | 676730773252 |
| 22 | 2978405318453 |
| 23 | 13149337960554 |
| 24 | 58218455727085 |
| 25 | 258435947527696 |
| 26 | 1149982662789042 |
[2,3,9,28,97,346,1302,5014,19830,79813,326344, 1350918,5652334,23861787,101519790,434827232, 1873491739,8114411769,35309142309,154288183928, 676730773252,2978405318453,13149337960554, 58218455727085,258435947527696,1149982662789042] |