A009160 - OEIS

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A009160 as a simple table

n	a(n)
0	1
1	2
2	20
3	448
4	17296
5	1013600
6	83547584
7	9196867072
8	1301697829120
9	230093807905280
10	49636887216382976
11	12825384465418534912
12	3908078275606800338944
13	1386160615200497825275904

[1,2,20,448,17296,1013600,83547584,9196867072, 1301697829120,230093807905280,49636887216382976, 12825384465418534912,3908078275606800338944, 1386160615200497825275904]