A166603 - OEIS

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A166603 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	10752000000000
11	215040000000000
12	4300799999999790
13	86015999999991600
14	1720319999999748210
15	34406399999993288400

[1,21,420,8400,168000,3360000,67200000,1344000000, 26880000000,537600000000,10752000000000, 215040000000000,4300799999999790, 86015999999991600,1720319999999748210, 34406399999993288400]