A120083 - OEIS

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A120083 as a simple table

n	a(n)
0	1
1	4
2	36
3	1
4	3600
5	1
6	211680
7	1
8	10886400
9	1
10	526901760
11	1
12	16999766784000
13	1
14	1120863744000
15	1
16	181400588328960000
17	1
18	97072790126247936000
19	1
20	16860010916664115200000
21	1
22	324325300906011525120000
23	1

[1,4,36,1,3600,1,211680,1,10886400,1,526901760,1, 16999766784000,1,1120863744000,1, 181400588328960000,1,97072790126247936000,1, 16860010916664115200000,1, 324325300906011525120000,1]