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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 0 |
| 5 | 5 |
| 6 | 3 |
| 7 | 5 |
| 8 | 28 |
| 9 | 57 |
| 10 | 90 |
| 11 | 241 |
| 12 | 684 |
| 13 | 1391 |
| 14 | 3368 |
| 15 | 9387 |
| 16 | 22377 |
| 17 | 55330 |
| 18 | 147531 |
| 19 | 379551 |
| 20 | 976967 |
| 21 | 2572030 |
| 22 | 6776369 |
| 23 | 17834031 |
| 24 | 47207259 |
| 25 | 125487309 |
| 26 | 333813100 |
| 27 | 889652401 |
| 28 | 2378119544 |
| 29 | 6367722606 |
| 30 | 17075640443 |
| 31 | 45881515131 |
[0,0,5,3,5,28,57,90,241,684,1391,3368,9387,22377, 55330,147531,379551,976967,2572030,6776369, 17834031,47207259,125487309,333813100,889652401, 2378119544,6367722606,17075640443,45881515131] |