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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 18 |
| 4 | 32 |
| 5 | 82 |
| 6 | 162 |
| 7 | 388 |
| 8 | 806 |
| 9 | 1858 |
| 10 | 3968 |
| 11 | 8962 |
| 12 | 19426 |
| 13 | 43396 |
| 14 | 94822 |
| 15 | 210578 |
| 16 | 462112 |
| 17 | 1022994 |
| 18 | 2250178 |
| 19 | 4972804 |
| 20 | 10951878 |
| 21 | 24180994 |
| 22 | 53291008 |
| 23 | 117604738 |
| 24 | 259275842 |
| 25 | 572028164 |
| 26 | 1261360966 |
| 27 | 2782483346 |
| 28 | 6136209184 |
| 29 | 13535050578 |
| 30 | 29850527586 |
[1,6,18,32,82,162,388,806,1858,3968,8962,19426, 43396,94822,210578,462112,1022994,2250178,4972804, 10951878,24180994,53291008,117604738,259275842, 572028164,1261360966,2782483346,6136209184, 13535050578,29850527586] |