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| n | a(n) |
|---|---|
| 3 | 6 |
| 4 | 40 |
| 5 | 70 |
| 6 | 6048 |
| 7 | 11088 |
| 8 | 2471040 |
| 9 | 4633200 |
| 10 | 8236800 |
| 11 | 14002560 |
| 12 | 2559871641600 |
| 13 | 4906420646400 |
| 14 | 4981904040960000 |
| 15 | 9607957793280000 |
| 16 | 17934854547456000 |
| 17 | 32506923867264000 |
| 18 | 48825552622389903360000 |
| 19 | 94938574543535923200000 |
[6,40,70,6048,11088,2471040,4633200,8236800, 14002560,2559871641600,4906420646400, 4981904040960000,9607957793280000, 17934854547456000,32506923867264000, 48825552622389903360000,94938574543535923200000] |