A338951 - OEIS

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A338951 as a simple table

n	a(n)
1	1
2	6504
3	8416440
4	1455789440
5	80139247500
6	2125945744776
7	34026498820524
8	376045864704000
9	3131319814422255
10	20854395850585000
11	115919421344402676
12	554976171149122944
13	2343894146343268610
14	8896568181794053320

[1,6504,8416440,1455789440,80139247500, 2125945744776,34026498820524,376045864704000, 3131319814422255,20854395850585000, 115919421344402676,554976171149122944, 2343894146343268610,8896568181794053320]