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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 5 |
| 4 | 22 |
| 5 | 91 |
| 6 | 286 |
| 7 | 863 |
| 8 | 2577 |
| 9 | 7717 |
| 10 | 23160 |
| 11 | 69939 |
| 12 | 209485 |
| 13 | 627826 |
| 14 | 1881554 |
| 15 | 5645226 |
| 16 | 16936048 |
[0,0,5,22,91,286,863,2577,7717,23160,69939,209485, 627826,1881554,5645226,16936048] |