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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 1120 |
| 3 | 627200 |
| 4 | 896896000 |
| 5 | 2611761152000 |
| 6 | 13497581633536000 |
| 7 | 112839782456360960000 |
| 8 | 1427423248072966144000000 |
| 9 | 25979103114927983820800000000 |
| 10 | 653945983608967208737177600000000 |
| 11 | 22056290135163246016287526092800000000 |
| 12 | 971138454651237722097139773865984000000000 |
[1,8,1120,627200,896896000,2611761152000, 13497581633536000,112839782456360960000, 1427423248072966144000000, 25979103114927983820800000000, 653945983608967208737177600000000, 22056290135163246016287526092800000000, 971138454651237722097139773865984000000000] |