A083957 - OEIS

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A083957 as a simple table

n	a(n)
1	1
2	252
3	8864856
4	40638618022744
5	23098236228791472696480
6	1568841035670687222903484318855680
7	12397389650957442295025809189993580551236444160

[1,252,8864856,40638618022744, 23098236228791472696480, 1568841035670687222903484318855680, 12397389650957442295025809189993580551236444160]