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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 74 |
| 4 | 2186 |
| 5 | 106524 |
| 6 | 7703896 |
| 7 | 773034912 |
| 8 | 102673179360 |
| 9 | 17429291711280 |
| 10 | 3680338415133024 |
| 11 | 945958227345434016 |
| 12 | 290761516548473591232 |
| 13 | 105309706114422166775040 |
| 14 | 44384982810939832477305600 |
| 15 | 21536846291826596564956445184 |
[1,1,5,74,2186,106524,7703896,773034912, 102673179360,17429291711280,3680338415133024, 945958227345434016,290761516548473591232, 105309706114422166775040, 44384982810939832477305600, 21536846291826596564956445184] |