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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 6 |
| 3 | 3 |
| 4 | 30 |
| 5 | 27 |
| 6 | 162 |
| 7 | 171 |
| 8 | 885 |
| 9 | 987 |
| 10 | 4839 |
| 11 | 5502 |
| 12 | 26436 |
| 13 | 30216 |
[0,0,6,3,30,27,162,171,885,987,4839,5502,26436, 30216] |