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| n | a(n) |
|---|---|
| 1 | 640000 |
| 2 | 30233088 |
| 3 | 1406076928 |
| 4 | 80675315712 |
| 5 | 4279521280000 |
| 6 | 219711187058688 |
| 7 | 11244238474313728 |
| 8 | 700611776439386112 |
| 9 | 40435085627883520000 |
| 10 | 2290196951375479308288 |
| 11 | 131119070760867387670528 |
[640000,30233088,1406076928,80675315712, 4279521280000,219711187058688,11244238474313728, 700611776439386112,40435085627883520000, 2290196951375479308288,131119070760867387670528] |