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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 6 |
| 2 | 32 |
| 3 | 480 |
| 4 | 36400 |
| 5 | 15811200 |
| 6 | 48402042480 |
| 7 | 1206043046666640 |
| 8 | 276580685164781030400 |
| 9 | 652981562430940302718878720 |
| 10 | 17542316699101442389453162362832320 |
| 11 | 5863769800904933880463358889014242882022400 |
| 12 | 26512736336116399269871416473897490370043694674400000 |
[3,6,32,480,36400,15811200,48402042480, 1206043046666640,276580685164781030400, 652981562430940302718878720, 17542316699101442389453162362832320, 5863769800904933880463358889014242882022400, 26512736336116399269871416473897490370043694674400\ 000] |