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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 112 |
| 4 | 31360 |
| 5 | 114150400 |
| 6 | 6648119296000 |
| 7 | 7356542888181760000 |
| 8 | 179090034163620983603200000 |
| 9 | 108995627512253039588776345600000000 |
| 10 | 1857397104331364341705287836001894400000000000 |
| 11 | 981210407605679794692064339146706741991833600000000000000 |
[1,1,4,112,31360,114150400,6648119296000, 7356542888181760000,179090034163620983603200000, 108995627512253039588776345600000000, 1857397104331364341705287836001894400000000000, 98121040760567979469206433914670674199183360000000\ 0000000] |