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| n | a(n) |
|---|---|
| 0 | 279936 |
| 1 | 612220032 |
| 2 | 21870000000 |
| 3 | 230539333248 |
| 4 | 1338925209984 |
| 5 | 5455160701056 |
| 6 | 17565568854912 |
| 7 | 47829690000000 |
| 8 | 114868566764928 |
| 9 | 250226879128704 |
| 10 | 504189521813376 |
| 11 | 953133216331392 |
| 12 | 1708593750000000 |
[279936,612220032,21870000000,230539333248, 1338925209984,5455160701056,17565568854912, 47829690000000,114868566764928,250226879128704, 504189521813376,953133216331392,1708593750000000] |