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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 16 |
| 2 | 560 |
| 3 | 42880 |
| 4 | 5692160 |
| 5 | 1158860800 |
| 6 | 335091660800 |
| 7 | 130514735104000 |
| 8 | 65860132462592000 |
| 9 | 41792278392537088000 |
| 10 | 32569972497977507840000 |
| 11 | 30580999289444580720640000 |
| 12 | 34048056335378925092864000000 |
[2,16,560,42880,5692160,1158860800,335091660800, 130514735104000,65860132462592000, 41792278392537088000,32569972497977507840000, 30580999289444580720640000, 34048056335378925092864000000] |