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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 10 |
| 4 | 100 |
| 5 | 44200 |
| 6 | 1635400 |
| 7 | 5315050000 |
| 8 | 435834100000 |
| 9 | 5370347780200000 |
| 10 | 26078677338040210000000 |
| 11 | 5893781078397087460000000 |
| 12 | 142760638726203851727985000000000 |
| 13 | 20723419838773203524537758570000000000 |
| 14 | 9159751568737755957845689287940000000000 |
| 15 | 2354514140744040168964234431464977000000000000 |
[2,10,100,44200,1635400,5315050000,435834100000, 5370347780200000,26078677338040210000000, 5893781078397087460000000, 142760638726203851727985000000000, 20723419838773203524537758570000000000, 9159751568737755957845689287940000000000, 2354514140744040168964234431464977000000000000] |