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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | 4 |
| 6 | 8 |
| 7 | 13 |
| 8 | 22 |
| 9 | 34 |
| 10 | 52 |
| 11 | 77 |
| 12 | 114 |
| 13 | 166 |
| 14 | 240 |
| 15 | 345 |
| 16 | 494 |
| 17 | 705 |
| 18 | 1004 |
| 19 | 1427 |
| 20 | 2026 |
| 21 | 2873 |
| 22 | 4072 |
| 23 | 5767 |
| 24 | 8166 |
| 25 | 11558 |
| 26 | 16356 |
| 27 | 23141 |
| 28 | 32738 |
| 29 | 46309 |
| 30 | 65504 |
| 31 | 92648 |
| 32 | 131038 |
| 33 | 185328 |
| 34 | 262108 |
| 35 | 370690 |
| 36 | 524250 |
| 37 | 741416 |
| 38 | 1048536 |
| 39 | 1482869 |
| 40 | 2097110 |
| 41 | 2965777 |
[0,0,0,2,4,8,13,22,34,52,77,114,166,240,345,494, 705,1004,1427,2026,2873,4072,5767,8166,11558, 16356,23141,32738,46309,65504,92648,131038,185328, 262108,370690,524250,741416,1048536,1482869, 2097110,2965777] |