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A015775
as a simple table
n
a(n)
1
2
2
4
3
16
4
25
5
170
6
256
7
264
8
1920
9
9384
10
26664
11
65536
12
263040
13
437760
14
1057800
15
2038648320
[2,4,16,25,170,256,264,1920,9384,26664,65536, 263040,437760,1057800,2038648320]