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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 5 |
| 2 | 8 |
| 3 | 12 |
| 4 | 18 |
| 5 | 29 |
| 6 | 49 |
| 7 | 88 |
| 8 | 165 |
| 9 | 317 |
| 10 | 620 |
| 11 | 1225 |
| 12 | 2434 |
| 13 | 4851 |
| 14 | 9683 |
| 15 | 19346 |
| 16 | 38671 |
| 17 | 77320 |
| 18 | 154617 |
| 19 | 309210 |
| 20 | 618395 |
| 21 | 1236764 |
| 22 | 2473501 |
| 23 | 4946974 |
| 24 | 9893918 |
| 25 | 19787805 |
| 26 | 39575578 |
| 27 | 79151123 |
| 28 | 158302212 |
| 29 | 316604389 |
| 30 | 633208742 |
[3,5,8,12,18,29,49,88,165,317,620,1225,2434,4851, 9683,19346,38671,77320,154617,309210,618395, 1236764,2473501,4946974,9893918,19787805,39575578, 79151123,158302212,316604389,633208742] |