A227927 - OEIS

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A227927 as a simple table

n	a(n)
1	1
2	2
3	36
4	144
5	576
6	3600
7	14400
8	921600
9	1040400
10	4161600
11	8643600
12	34574400
13	266342400
14	700131600
15	2800526400
16	179233689600
17	202338032400
18	809352129600

[1,2,36,144,576,3600,14400,921600,1040400,4161600, 8643600,34574400,266342400,700131600,2800526400, 179233689600,202338032400,809352129600]