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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 504 |
| 2 | 524664 |
| 3 | 682155936 |
| 4 | 993260754360 |
| 5 | 1549502199011088 |
| 6 | 2532317522698504800 |
| 7 | 4279562991330657500736 |
| 8 | 7417781163248322999957048 |
| 9 | 13114370611008351235424557656 |
| 10 | 23557650424885130928376974026832 |
| 11 | 42873898555113763448790865162056672 |
| 12 | 78885999686148803144416784491001491680 |
[1,504,524664,682155936,993260754360, 1549502199011088,2532317522698504800, 4279562991330657500736,7417781163248322999957048, 13114370611008351235424557656, 23557650424885130928376974026832, 42873898555113763448790865162056672, 78885999686148803144416784491001491680] |