A166225 - OEIS

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A166225 as a simple table

n	a(n)
0	1
1	41
2	1640
3	65600
4	2624000
5	104960000
6	4198400000
7	167936000000
8	6717440000000
9	268697600000000
10	10747903999999180
11	429916159999934400
12	17196646399996064820
13	687865855999790145600
14	27514634239989507936000

[1,41,1640,65600,2624000,104960000,4198400000, 167936000000,6717440000000,268697600000000, 10747903999999180,429916159999934400, 17196646399996064820,687865855999790145600, 27514634239989507936000]