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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 3 |
| 5 | 13 |
| 6 | 93 |
| 7 | 796 |
| 8 | 10931 |
| 9 | 260340 |
| 10 | 11713182 |
| 11 | 1006682063 |
| 12 | 164059710255 |
| 13 | 50335906936959 |
| 14 | 29003487454251217 |
| 15 | 31397381142667479256 |
| 16 | 63969560113223974443840 |
| 17 | 245871831682084008526845525 |
| 18 | 1787331725248899088577102145274 |
| 19 | 24636021429399867655316345340289103 |
[0,0,0,3,13,93,796,10931,260340,11713182, 1006682063,164059710255,50335906936959, 29003487454251217,31397381142667479256, 63969560113223974443840, 245871831682084008526845525, 1787331725248899088577102145274, 24636021429399867655316345340289103] |