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A206239 as a simple table
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 24 |
| 5 | 309 |
| 6 | 8807 |
| 7 | 530356 |
| 8 | 65679652 |
| 9 | 16512273616 |
| 10 | 8370804628178 |
| 11 | 8525389679187197 |
| 12 | 17408681737224080093 |
| 13 | 71192609533782031405771 |
| 14 | 582711051458083440858730497 |
| 15 | 9542765396943645975520145941300 |
| 16 | 312620974584432225019935558843189172 |
| 17 | 20485270547000003746699189223065768145956 |
[0,1,4,24,309,8807,530356,65679652,16512273616, 8370804628178,8525389679187197, 17408681737224080093,71192609533782031405771, 582711051458083440858730497, 9542765396943645975520145941300, 312620974584432225019935558843189172, 20485270547000003746699189223065768145956] |