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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 102 |
| 4 | 8548 |
| 5 | 4211744 |
| 6 | 8590557312 |
| 7 | 70368882591744 |
| 8 | 2305843028004192256 |
| 9 | 302231454921524358152192 |
| 10 | 158456325028538104598816096256 |
| 11 | 332306998946229005407670289177772032 |
| 12 | 2787593149816327892769293535238052808491008 |
[1,2,6,102,8548,4211744,8590557312,70368882591744, 2305843028004192256,302231454921524358152192, 158456325028538104598816096256, 332306998946229005407670289177772032, 2787593149816327892769293535238052808491008] |