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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 96 |
| 4 | 1536 |
| 5 | 30720 |
| 6 | 737280 |
| 7 | 20643840 |
| 8 | 660602880 |
| 9 | 23781703680 |
| 10 | 951268147200 |
| 11 | 41855798476800 |
| 12 | 2009078326886400 |
| 13 | 104472072998092800 |
| 14 | 5850436087893196800 |
| 15 | 351026165273591808000 |
| 16 | 22465674577509875712000 |
| 17 | 1527665871270671548416000 |
| 18 | 109991942731488351485952000 |
[1,8,96,1536,30720,737280,20643840,660602880, 23781703680,951268147200,41855798476800, 2009078326886400,104472072998092800, 5850436087893196800,351026165273591808000, 22465674577509875712000,1527665871270671548416000, 109991942731488351485952000] |