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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 0 |
| 5 | 3 |
| 6 | 4 |
| 7 | 6 |
| 8 | 25 |
| 9 | 48 |
| 10 | 82 |
| 11 | 234 |
| 12 | 677 |
| 13 | 1361 |
| 14 | 3385 |
| 15 | 9355 |
| 16 | 22889 |
| 17 | 56816 |
| 18 | 151208 |
| 19 | 391907 |
| 20 | 1012586 |
| 21 | 2658813 |
| 22 | 7012558 |
| 23 | 18453474 |
| 24 | 48810225 |
| 25 | 129638661 |
| 26 | 344774554 |
| 27 | 918443384 |
| 28 | 2454132040 |
| 29 | 6570320301 |
| 30 | 17618843114 |
| 31 | 47338336044 |
[0,0,3,4,6,25,48,82,234,677,1361,3385,9355,22889, 56816,151208,391907,1012586,2658813,7012558, 18453474,48810225,129638661,344774554,918443384, 2454132040,6570320301,17618843114,47338336044] |