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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 123 |
| 3 | 604 |
| 4 | 2045 |
| 5 | 5706 |
| 6 | 26507 |
| 7 | 76228 |
| 8 | 190309 |
| 9 | 426610 |
| 10 | 879757 |
| 11 | 1694154 |
| 12 | 3254197 |
| 13 | 5570468 |
| 14 | 8901675 |
| 15 | 13452950 |
| 16 | 19622477 |
| 17 | 27976024 |
| 18 | 40253031 |
| 19 | 56174354 |
| 20 | 76717913 |
| 21 | 102403416 |
| 22 | 134456857 |
| 23 | 173778354 |
| 24 | 225248401 |
| 25 | 287508526 |
| 26 | 361941419 |
| 27 | 450013456 |
[2,123,604,2045,5706,26507,76228,190309,426610, 879757,1694154,3254197,5570468,8901675,13452950, 19622477,27976024,40253031,56174354,76717913, 102403416,134456857,173778354,225248401,287508526, 361941419,450013456] |