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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 6 |
| 4 | 24 |
| 5 | 78 |
| 6 | 186 |
| 7 | 372 |
| 8 | 876 |
| 9 | 1632 |
| 10 | 3024 |
| 11 | 5310 |
| 12 | 8496 |
| 13 | 13344 |
| 14 | 21186 |
| 15 | 31878 |
| 16 | 46752 |
| 17 | 66936 |
| 18 | 94800 |
| 19 | 130194 |
[0,0,0,6,24,78,186,372,876,1632,3024,5310,8496, 13344,21186,31878,46752,66936,94800,130194] |