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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 48 |
| 2 | 768 |
| 3 | 645120 |
| 4 | 37158912 |
| 5 | 81749606400 |
| 6 | 784796221440 |
| 7 | 42849873690624000 |
| 8 | 548478383239987200 |
| 9 | 63777066403145711616000 |
| 10 | 4285818862291391820595200 |
| 11 | 216862434431944426122117120000 |
| 12 | 8007228348256409579893555200000 |
| 13 | 1461479318123759876522171695104000000 |
[2,48,768,645120,37158912,81749606400, 784796221440,42849873690624000,548478383239987200, 63777066403145711616000,4285818862291391820595200, 216862434431944426122117120000, 8007228348256409579893555200000, 1461479318123759876522171695104000000] |