A168818 - OEIS

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A168818 as a simple table

n	a(n)
0	1
1	45
2	1980
3	87120
4	3833280
5	168664320
6	7421230080
7	326534123520
8	14367501434880
9	632170063134720
10	27815482777927680
11	1223881242228817920
12	53850774658067988480
13	2369434084954991493120
14	104255099738019625697280

[1,45,1980,87120,3833280,168664320,7421230080, 326534123520,14367501434880,632170063134720, 27815482777927680,1223881242228817920, 53850774658067988480,2369434084954991493120, 104255099738019625697280]