A165894 - OEIS

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A165894 as a simple table

n	a(n)
0	1
1	21
2	420
3	8400
4	168000
5	3360000
6	67200000
7	1344000000
8	26880000000
9	537600000000
10	10751999999790
11	215039999991600
12	4300799999748210
13	86015999993288400
14	1720319999832252000
15	34406399995974720000

[1,21,420,8400,168000,3360000,67200000,1344000000, 26880000000,537600000000,10751999999790, 215039999991600,4300799999748210, 86015999993288400,1720319999832252000, 34406399995974720000]