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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 0 |
| 4 | 4 |
| 5 | 6 |
| 6 | 10 |
| 7 | 21 |
| 8 | 40 |
| 9 | 87 |
| 10 | 121 |
| 11 | 219 |
| 12 | 421 |
| 13 | 690 |
| 14 | 1159 |
| 15 | 1782 |
| 16 | 3304 |
| 17 | 5190 |
| 18 | 8212 |
| 19 | 12897 |
| 20 | 22084 |
| 21 | 33255 |
| 22 | 53617 |
| 23 | 82539 |
| 24 | 124849 |
| 25 | 206172 |
| 26 | 313339 |
| 27 | 472056 |
| 28 | 714976 |
| 29 | 1077996 |
| 30 | 1682806 |
| 31 | 2502645 |
| 32 | 3804460 |
| 33 | 5674305 |
| 34 | 8340535 |
| 35 | 12245241 |
| 36 | 18851899 |
| 37 | 27570366 |
| 38 | 40385431 |
| 39 | 59314572 |
[1,0,4,6,10,21,40,87,121,219,421,690,1159,1782, 3304,5190,8212,12897,22084,33255,53617,82539, 124849,206172,313339,472056,714976,1077996, 1682806,2502645,3804460,5674305,8340535,12245241, 18851899,27570366,40385431,59314572] |