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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 4 |
| 2 | 10 |
| 3 | 18 |
| 4 | 38 |
| 5 | 74 |
| 6 | 150 |
| 7 | 298 |
| 8 | 598 |
| 9 | 1194 |
| 10 | 2390 |
| 11 | 4778 |
| 12 | 9558 |
| 13 | 19114 |
| 14 | 38230 |
| 15 | 76458 |
| 16 | 152918 |
| 17 | 305834 |
| 18 | 611670 |
| 19 | 1223338 |
| 20 | 2446678 |
| 21 | 4893354 |
| 22 | 9786710 |
| 23 | 19573418 |
| 24 | 39146838 |
| 25 | 78293674 |
| 26 | 156587350 |
| 27 | 313174698 |
| 28 | 626349398 |
| 29 | 1252698794 |
| 30 | 2505397590 |
| 31 | 5010795178 |
| 32 | 10021590358 |
[3,4,10,18,38,74,150,298,598,1194,2390,4778,9558, 19114,38230,76458,152918,305834,611670,1223338, 2446678,4893354,9786710,19573418,39146838, 78293674,156587350,313174698,626349398,1252698794, 2505397590,5010795178,10021590358] |