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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 2 |
| 8 | 7 |
| 9 | 23 |
| 10 | 78 |
| 11 | 261 |
| 12 | 887 |
| 13 | 3008 |
| 14 | 10268 |
| 15 | 35112 |
| 16 | 120445 |
| 17 | 413979 |
| 18 | 1425919 |
| 19 | 4919635 |
| 20 | 17000553 |
| 21 | 58828575 |
| 22 | 203826882 |
| 23 | 707008418 |
| 24 | 2454916048 |
| 25 | 8532126320 |
| 26 | 29679297122 |
| 27 | 103322632386 |
| 28 | 359962092302 |
| 29 | 1254914172463 |
| 30 | 4377704183644 |
| 31 | 15280415561913 |
| 32 | 53365850603107 |
[1,2,7,23,78,261,887,3008,10268,35112,120445, 413979,1425919,4919635,17000553,58828575, 203826882,707008418,2454916048,8532126320, 29679297122,103322632386,359962092302, 1254914172463,4377704183644,15280415561913, 53365850603107] |