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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 8 |
| 4 | 25 |
| 5 | 67 |
| 6 | 165 |
| 7 | 387 |
| 8 | 881 |
| 9 | 1967 |
| 10 | 4333 |
| 11 | 9451 |
| 12 | 20457 |
| 13 | 44007 |
| 14 | 94181 |
| 15 | 200675 |
| 16 | 425953 |
| 17 | 901087 |
| 18 | 1900509 |
| 19 | 3997659 |
| 20 | 8388569 |
| 21 | 17563607 |
| 22 | 36700117 |
| 23 | 76546003 |
| 24 | 159383505 |
| 25 | 331349967 |
| 26 | 687865805 |
| 27 | 1426063307 |
| 28 | 2952789961 |
| 29 | 6106906567 |
[2,8,25,67,165,387,881,1967,4333,9451,20457,44007, 94181,200675,425953,901087,1900509,3997659, 8388569,17563607,36700117,76546003,159383505, 331349967,687865805,1426063307,2952789961, 6106906567] |