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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 18 |
| 2 | 216 |
| 3 | 6480 |
| 4 | 1088640 |
| 5 | 3628800 |
| 6 | 4311014400 |
| 7 | 2353813862400 |
| 8 | 564915326976000 |
| 9 | 57621363351552000 |
| 10 | 5971668565524480000 |
| 11 | 30348019649995407360000 |
| 12 | 75801388447047352320000 |
| 13 | 32666608351255056482304000000 |
| 14 | 2743995101505424744513536000000 |
[3,18,216,6480,1088640,3628800,4311014400, 2353813862400,564915326976000,57621363351552000, 5971668565524480000,30348019649995407360000, 75801388447047352320000, 32666608351255056482304000000, 2743995101505424744513536000000] |