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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 15 |
| 4 | 232 |
| 5 | 2725 |
| 6 | 30350 |
| 7 | 324133 |
| 8 | 3386986 |
| 9 | 34984325 |
| 10 | 358604948 |
| 11 | 3657365837 |
| 12 | 37164550469 |
| 13 | 376613845818 |
| 14 | 3808514755978 |
[0,0,15,232,2725,30350,324133,3386986,34984325, 358604948,3657365837,37164550469,376613845818, 3808514755978] |