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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 4782969 |
| 2 | 612220032 |
| 3 | 10460353203 |
| 4 | 78364164096 |
| 5 | 373669453125 |
| 6 | 1338925209984 |
| 7 | 3938980639167 |
| 8 | 10030613004288 |
| 9 | 22876792454961 |
| 10 | 47829690000000 |
| 11 | 93206534790699 |
| 12 | 171382426877952 |
| 13 | 300124211606973 |
[0,4782969,612220032,10460353203,78364164096, 373669453125,1338925209984,3938980639167, 10030613004288,22876792454961,47829690000000, 93206534790699,171382426877952,300124211606973] |