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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 8 |
| 3 | 20 |
| 4 | 49 |
| 5 | 119 |
| 6 | 289 |
| 7 | 705 |
| 8 | 1731 |
| 9 | 4283 |
| 10 | 10690 |
| 11 | 26934 |
| 12 | 68531 |
| 13 | 176115 |
| 14 | 457110 |
| 15 | 1198128 |
| 16 | 3170607 |
| 17 | 8468277 |
| 18 | 22818167 |
| 19 | 61999531 |
| 20 | 169778889 |
| 21 | 468292663 |
| 22 | 1300270333 |
| 23 | 3632269293 |
| 24 | 10202425207 |
| 25 | 28798822159 |
| 26 | 81652955889 |
| 27 | 232429744843 |
| 28 | 663969970203 |
| 29 | 1902716831527 |
[1,3,8,20,49,119,289,705,1731,4283,10690,26934, 68531,176115,457110,1198128,3170607,8468277, 22818167,61999531,169778889,468292663,1300270333, 3632269293,10202425207,28798822159,81652955889, 232429744843,663969970203,1902716831527] |