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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 364 |
| 5 | 49280 |
| 6 | 27297360 |
| 7 | 59855127360 |
| 8 | 515600292989376 |
| 9 | 17478262497392546432 |
| 10 | 2341170788069821884925696 |
| 11 | 1243964516830446590036473921536 |
| 12 | 2629751195406987463208250109864126464 |
[1,2,12,364,49280,27297360,59855127360, 515600292989376,17478262497392546432, 2341170788069821884925696, 1243964516830446590036473921536, 2629751195406987463208250109864126464] |