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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 6 |
| 4 | 6 |
| 5 | 12 |
| 6 | 18 |
| 7 | 30 |
| 8 | 42 |
| 9 | 36 |
| 10 | 54 |
| 11 | 138 |
| 12 | 168 |
| 13 | 234 |
| 14 | 294 |
| 15 | 390 |
| 16 | 540 |
[0,0,6,6,12,18,30,42,36,54,138,168,234,294,390, 540] |