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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 15 |
| 4 | 19391512129 |
| 5 | 703237958001393736999896827714634659411015090272684227831001142371615151 |
[0,0,0,15,19391512129, 70323795800139373699989682771463465941101509027268\ 4227831001142371615151] |