A293708 - OEIS

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A293708 as a simple table

n	a(n)
1	1
2	4
3	16
4	36
5	144
6	576
7	3600
8	14400
9	32400
10	129600
11	291600
12	1166400
13	8643600
14	34574400
15	77792400
16	84272400
17	311169600
18	337089600
19	700131600
20	2800526400
21	179233689600
22	202338032400
23	809352129600

[1,4,16,36,144,576,3600,14400,32400,129600,291600, 1166400,8643600,34574400,77792400,84272400, 311169600,337089600,700131600,2800526400, 179233689600,202338032400,809352129600]