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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 0 |
| 5 | 6 |
| 6 | 3 |
| 7 | 3 |
| 8 | 36 |
| 9 | 55 |
| 10 | 88 |
| 11 | 293 |
| 12 | 622 |
| 13 | 1275 |
| 14 | 3321 |
| 15 | 8111 |
| 16 | 19719 |
| 17 | 50176 |
| 18 | 127767 |
| 19 | 330678 |
| 20 | 860375 |
| 21 | 2243544 |
| 22 | 5920336 |
| 23 | 15645065 |
| 24 | 41326177 |
| 25 | 109675127 |
| 26 | 291443985 |
| 27 | 774395373 |
| 28 | 2061553580 |
| 29 | 5495695788 |
| 30 | 14661522117 |
| 31 | 39166097080 |
[0,0,6,3,3,36,55,88,293,622,1275,3321,8111,19719, 50176,127767,330678,860375,2243544,5920336, 15645065,41326177,109675127,291443985,774395373, 2061553580,5495695788,14661522117,39166097080] |