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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 0 |
| 6 | 4 |
| 7 | 6 |
| 8 | 10 |
| 9 | 36 |
| 10 | 48 |
| 11 | 126 |
| 12 | 259 |
| 13 | 456 |
| 14 | 1064 |
| 15 | 1956 |
| 16 | 3939 |
| 17 | 8112 |
| 18 | 15300 |
| 19 | 31174 |
| 20 | 60951 |
| 21 | 118580 |
| 22 | 236456 |
| 23 | 458172 |
| 24 | 900185 |
| 25 | 1765556 |
| 26 | 3431792 |
| 27 | 6728410 |
| 28 | 13107393 |
| 29 | 25538448 |
| 30 | 49856392 |
| 31 | 96966572 |
| 32 | 188914574 |
| 33 | 367741688 |
| 34 | 715053048 |
| 35 | 1391512424 |
| 36 | 2705016795 |
| 37 | 5258241032 |
[1,0,4,6,10,36,48,126,259,456,1064,1956,3939,8112, 15300,31174,60951,118580,236456,458172,900185, 1765556,3431792,6728410,13107393,25538448, 49856392,96966572,188914574,367741688,715053048, 1391512424,2705016795,5258241032] |