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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -6 |
| 3 | 142 |
| 4 | 31800 |
| 5 | -159468264 |
| 6 | -2481298801008 |
| 7 | 1414130111428687344 |
| 8 | 1827317023092830201950080 |
| 9 | -89946874545119714361987192509568 |
| 10 | -9262235489215916508714844705185660161280 |
[0,1,-6,142,31800,-159468264,-2481298801008, 1414130111428687344,1827317023092830201950080, -89946874545119714361987192509568, -9262235489215916508714844705185660161280] |