| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 4 |
| 7 | 7 |
| 8 | 14 |
| 9 | 29 |
| 10 | 61 |
| 11 | 129 |
| 12 | 282 |
| 13 | 623 |
| 14 | 1400 |
| 15 | 3189 |
| 16 | 7347 |
| 17 | 17101 |
| 18 | 40167 |
| 19 | 95110 |
| 20 | 226841 |
| 21 | 544555 |
| 22 | 1314983 |
| 23 | 3192458 |
| 24 | 7788521 |
| 25 | 19086807 |
| 26 | 46968280 |
| 27 | 116019696 |
| 28 | 287602234 |
| 29 | 715281652 |
| 30 | 1784383956 |
| 31 | 4464139806 |
[2,1,1,2,4,7,14,29,61,129,282,623,1400,3189,7347, 17101,40167,95110,226841,544555,1314983,3192458, 7788521,19086807,46968280,116019696,287602234, 715281652,1784383956,4464139806] |