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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 7 |
| 6 | 16 |
| 7 | 38 |
| 8 | 82 |
| 9 | 173 |
| 10 | 352 |
| 11 | 701 |
| 12 | 1368 |
| 13 | 2628 |
| 14 | 4980 |
| 15 | 9329 |
| 16 | 17302 |
| 17 | 31811 |
| 18 | 58040 |
| 19 | 105178 |
| 20 | 189446 |
| 21 | 339373 |
| 22 | 604964 |
| 23 | 1073593 |
| 24 | 1897488 |
| 25 | 3341160 |
| 26 | 5863080 |
| 27 | 10256065 |
| 28 | 17888138 |
| 29 | 31115071 |
| 30 | 53985856 |
| 31 | 93447278 |
| 32 | 161397754 |
| 33 | 278184461 |
| 34 | 478550344 |
| 35 | 821734901 |
| 36 | 1408610088 |
| 37 | 2410719084 |
| 38 | 4119433884 |
| 39 | 7029086705 |
| 40 | 11977419742 |
| 41 | 20382654971 |
| 42 | 34643298728 |
| 43 | 58811818210 |
[0,0,0,1,2,7,16,38,82,173,352,701,1368,2628,4980, 9329,17302,31811,58040,105178,189446,339373, 604964,1073593,1897488,3341160,5863080,10256065, 17888138,31115071,53985856,93447278,161397754, 278184461,478550344,821734901,1408610088, 2410719084,4119433884,7029086705,11977419742, 20382654971,34643298728,58811818210] |