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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 24 |
| 3 | 264 |
| 4 | 3312 |
| 5 | 48240 |
| 6 | 762096 |
| 7 | 12673920 |
| 8 | 218904768 |
| 9 | 3891176352 |
| 10 | 70742410800 |
| 11 | 1309643747808 |
| 12 | 24609869536800 |
| 13 | 468270744898944 |
| 14 | 9005391024862848 |
| 15 | 174776445357365040 |
| 16 | 3419171337633496704 |
[6,24,264,3312,48240,762096,12673920,218904768, 3891176352,70742410800,1309643747808, 24609869536800,468270744898944,9005391024862848, 174776445357365040,3419171337633496704] |