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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 2 |
| 6 | 4 |
| 7 | 6 |
| 8 | 9 |
| 9 | 13 |
| 10 | 26 |
| 11 | 42 |
| 12 | 65 |
| 13 | 120 |
| 14 | 199 |
| 15 | 380 |
| 16 | 705 |
| 17 | 1198 |
| 18 | 2165 |
| 19 | 4378 |
| 20 | 7777 |
| 21 | 15434 |
| 22 | 29756 |
| 23 | 56123 |
| 24 | 108476 |
| 25 | 214312 |
| 26 | 431949 |
| 27 | 848087 |
| 28 | 1734059 |
| 29 | 3453977 |
| 30 | 6860860 |
| 31 | 14190308 |
| 32 | 29015321 |
| 33 | 58878342 |
| 34 | 125079416 |
| 35 | 252639751 |
| 36 | 538588352 |
| 37 | 1118956637 |
| 38 | 2319897442 |
| 39 | 4878685666 |
| 40 | 10457753776 |
[1,1,1,2,2,4,6,9,13,26,42,65,120,199,380,705,1198, 2165,4378,7777,15434,29756,56123,108476,214312, 431949,848087,1734059,3453977,6860860,14190308, 29015321,58878342,125079416,252639751,538588352, 1118956637,2319897442,4878685666,10457753776] |