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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 36 |
| 3 | 161 |
| 4 | 581 |
| 5 | 1792 |
| 6 | 4900 |
| 7 | 12174 |
| 8 | 27966 |
| 9 | 60172 |
| 10 | 122464 |
| 11 | 237590 |
| 12 | 442118 |
| 13 | 793092 |
| 14 | 1377174 |
| 15 | 2322967 |
| 16 | 3817351 |
| 17 | 6126818 |
| 18 | 9624964 |
| 19 | 14827487 |
| 20 | 22436251 |
| 21 | 33394208 |
| 22 | 48953224 |
| 23 | 70757132 |
| 24 | 100942636 |
| 25 | 142261016 |
| 26 | 198223936 |
| 27 | 273277036 |
| 28 | 373005396 |
[6,36,161,581,1792,4900,12174,27966,60172,122464, 237590,442118,793092,1377174,2322967,3817351, 6126818,9624964,14827487,22436251,33394208, 48953224,70757132,100942636,142261016,198223936, 273277036,373005396] |