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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 0 |
| 5 | 6 |
| 6 | 6 |
| 7 | 4 |
| 8 | 29 |
| 9 | 62 |
| 10 | 96 |
| 11 | 260 |
| 12 | 727 |
| 13 | 1433 |
| 14 | 3356 |
| 15 | 9050 |
| 16 | 21140 |
| 17 | 49236 |
| 18 | 128957 |
| 19 | 326370 |
| 20 | 811629 |
| 21 | 2114292 |
| 22 | 5545934 |
| 23 | 14421123 |
| 24 | 38017944 |
| 25 | 101077033 |
| 26 | 268425834 |
| 27 | 714902559 |
| 28 | 1911938250 |
| 29 | 5117689000 |
| 30 | 13709052945 |
| 31 | 36788511928 |
[0,0,6,6,4,29,62,96,260,727,1433,3356,9050,21140, 49236,128957,326370,811629,2114292,5545934, 14421123,38017944,101077033,268425834,714902559, 1911938250,5117689000,13709052945,36788511928] |