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A364505
as a simple table
n
a(n)
4
3
5
3
6
1
7
15
8
105
9
250
10
210
11
52
12
1
13
105
14
5460
15
105945
16
635265
17
1715455
18
2373345
19
1742445
20
640140
21
90262
22
1
[3,3,1,15,105,250,210,52,1,105,5460,105945,635265, 1715455,2373345,1742445,640140,90262,1]