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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 6 |
| 5 | 9 |
| 6 | 18 |
| 7 | 29 |
| 8 | 43 |
| 9 | 66 |
| 10 | 101 |
| 11 | 187 |
| 12 | 257 |
| 13 | 470 |
| 14 | 717 |
| 15 | 1033 |
| 16 | 1293 |
| 17 | 2442 |
| 18 | 3168 |
| 19 | 6011 |
| 20 | 7911 |
| 21 | 11179 |
| 22 | 16888 |
| 23 | 32603 |
| 24 | 39587 |
| 25 | 53063 |
| 26 | 79742 |
| 27 | 97707 |
| 28 | 127679 |
| 29 | 246428 |
| 30 | 302205 |
| 31 | 585129 |
| 32 | 670409 |
| 33 | 923535 |
| 34 | 1385145 |
| 35 | 1813935 |
| 36 | 2099557 |
| 37 | 4091926 |
| 38 | 6142573 |
| 39 | 8416157 |
[0,0,2,6,9,18,29,43,66,101,187,257,470,717,1033, 1293,2442,3168,6011,7911,11179,16888,32603,39587, 53063,79742,97707,127679,246428,302205,585129, 670409,923535,1385145,1813935,2099557,4091926, 6142573,8416157] |