A348847 - OEIS

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A348847 as a simple table

n	a(n)
1	1
2	2
3	4
4	8
5	16
6	36
7	144
8	576
9	900
10	3600
11	14400
12	32400
13	129600
14	435600
15	6969600
16	8643600
17	34574400
18	77792400
19	311169600
20	2498000400
21	2800526400
22	7779240000
23	9992001600
24	22482003600

[1,2,4,8,16,36,144,576,900,3600,14400,32400, 129600,435600,6969600,8643600,34574400,77792400, 311169600,2498000400,2800526400,7779240000, 9992001600,22482003600]